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Dr. Pascual D. Diago
Universitat de València

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0 Astrophysics
0 Mathematics Education
0 Problem Solving
0 Computational Thinking
0 ICT and education

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Astrophysics
Computational Thinking
Mathematics Education
Problem Solving
Mathematics education in kindergarten

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Journal article
Published: 27 August 2021 in International Journal of Child-Computer Interaction
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Interest in educational robotics has increased over the last decade. Through various approaches, robots are being used in the teaching and learning of different subjects at distinct education levels. The present study investigates the effects of an educational robotic intervention on the mental rotation and computational thinking assessment in a 3rd grade classroom. To this end, we carried out a quasi-experimental study involving 24 third-grade students. From an embodied approach, we have designed a two-hour intervention providing students with a physical environment to perform tangible programming on Bee-bot. The results revealed that this educational robotic proposal aimed at map-reading tasks leads to statistically significant gains in computational thinking. Moreover, students who followed the Bee-bot-based intervention achieved greater CT level compared to students following a traditional instruction approach, after controlling student’s prior level. No conclusive results were found in relation to mental rotation.

ACS Style

Pascual D. Diagoa; José A. González-Calerob; Dionisio F. Yáñez. Exploring the development of mental rotation and computational skills in elementary students through educational robotics. International Journal of Child-Computer Interaction 2021, 100388 .

AMA Style

Pascual D. Diagoa, José A. González-Calerob, Dionisio F. Yáñez. Exploring the development of mental rotation and computational skills in elementary students through educational robotics. International Journal of Child-Computer Interaction. 2021; ():100388.

Chicago/Turabian Style

Pascual D. Diagoa; José A. González-Calerob; Dionisio F. Yáñez. 2021. "Exploring the development of mental rotation and computational skills in elementary students through educational robotics." International Journal of Child-Computer Interaction , no. : 100388.

Journal article
Published: 07 August 2020 in Education Sciences
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Educational robotics are commonly present in kindergarten and primary school classrooms, particularly Bee-bot. Its ease of use allows the introduction of computer programming to young children in educational contexts from a science, technology, engineering, arts, and mathematics (STEAM) perspective. Despite this rise, there are still few investigations that collect evidence on the effectiveness of robotic interventions. Although mentoring experiences with robotics had been carried out in educational contexts, this work explores their effect on the acquisition of computational thinking skills through mentoring. Participants from the second grade, aged seven through eight years, were exposed to two sessions of robotics with Bee-bot in order to promote hands-on experimentation. The sessions were conducted by nine students of the fourth grade (the mentors), aged 10 to 11 years. A descriptive case-study methodology was employed for the analysis of the mentoring intervention. The effect of the mentoring experience was assessed in terms of motivation and computational thinking skills. Mixed quantitative and qualitative results show two important findings: (i) Mentoring is a powerful tool to be considered for improvement of the motivation and cooperation of students in their teaching–learning process, and (ii) computational thinking skills can be acquired by second-grade students through a mentoring process.

ACS Style

Núria Cervera; Pascual D. Diago; Lara Orcos; Dionisio F. Yáñez. The Acquisition of Computational Thinking through Mentoring: An Exploratory Study. Education Sciences 2020, 10, 202 .

AMA Style

Núria Cervera, Pascual D. Diago, Lara Orcos, Dionisio F. Yáñez. The Acquisition of Computational Thinking through Mentoring: An Exploratory Study. Education Sciences. 2020; 10 (8):202.

Chicago/Turabian Style

Núria Cervera; Pascual D. Diago; Lara Orcos; Dionisio F. Yáñez. 2020. "The Acquisition of Computational Thinking through Mentoring: An Exploratory Study." Education Sciences 10, no. 8: 202.

Journal article
Published: 21 December 2019 in Education Sciences
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Nowadays, Augmented Reality (AR) is one of the emerging technologies with a greater impact in the Education field. Research has proved that AR-based activities improve the teaching and learning processes. Also, the use of this type of technology in classroom facilitates the understanding of contents from different areas as Arts, Mathematics or Science. In this work we propose an AR-based instruction in order to explore the benefits in a 6th-grade Primary course related to 3D-geometry shapes. This first experiment, designed from an exploratory approach, will shed light on new study variables to perform new implementations whose conclusions become more consistent. The results obtained allow us to envisage that AR-based proposals slightly improve the classical didactic methods.

ACS Style

Míriam Flores-Bascuñana; Pascual D. Diago; Rafael Villena-Taranilla; Dionisio F. Yáñez. On Augmented Reality for the Learning of 3D-Geometric Contents: A Preliminary Exploratory Study with 6-Grade Primary Students. Education Sciences 2019, 10, 4 .

AMA Style

Míriam Flores-Bascuñana, Pascual D. Diago, Rafael Villena-Taranilla, Dionisio F. Yáñez. On Augmented Reality for the Learning of 3D-Geometric Contents: A Preliminary Exploratory Study with 6-Grade Primary Students. Education Sciences. 2019; 10 (1):4.

Chicago/Turabian Style

Míriam Flores-Bascuñana; Pascual D. Diago; Rafael Villena-Taranilla; Dionisio F. Yáñez. 2019. "On Augmented Reality for the Learning of 3D-Geometric Contents: A Preliminary Exploratory Study with 6-Grade Primary Students." Education Sciences 10, no. 1: 4.

Journal article
Published: 24 June 2019 in Research in Education and Learning Innovation Archives
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In this paper we present the fundamentals of software design capable of monitoring and recording data related to the management of mathematical problem solving processes. The software allows a systematic collection of the variables of the resolution process from which it is possible to obtain different student learning analytics. By not focusing exclusively on the final outcome of the resolution process, it is possible to identify cognitive tendencies of the students. In this manuscript we describe the characteristics of this technological environment together with the didactic basis that justifies the interest of research at school levels in which poor knowledge limits the formalization of problem solving situations. The first results of a pilot study that has allowed the evaluation of strengths and weaknesses of the developing version are attached. Finally, future directions for this technological environment are discussed as one more step in both innovation and research in Mathematics Education.

ACS Style

Pascual D. Diago; José A. González-Calero; David Arnau. Fundamentos de diseño de un entorno tecnológico para el estudio de las habilidades en resolución de problemas en primeras edades escolares. Research in Education and Learning Innovation Archives 2019, 60 -76.

AMA Style

Pascual D. Diago, José A. González-Calero, David Arnau. Fundamentos de diseño de un entorno tecnológico para el estudio de las habilidades en resolución de problemas en primeras edades escolares. Research in Education and Learning Innovation Archives. 2019; (22):60-76.

Chicago/Turabian Style

Pascual D. Diago; José A. González-Calero; David Arnau. 2019. "Fundamentos de diseño de un entorno tecnológico para el estudio de las habilidades en resolución de problemas en primeras edades escolares." Research in Education and Learning Innovation Archives , no. 22: 60-76.

Journal article
Published: 11 December 2018 in Revista de Educación de la Universidad de Granada
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Una de las finalidades de la enseñanza de las matemáticas en Educación Infantil es fomentar el pensamiento lógico, la creatividad y la capacidad para resolver problemas de los estudiantes. Entre las actividades escolares propias de estas edades es habitual encontrar tareas de identificación y continuación de patrones lineales de repetición. Esta actividad puede ser estudiada desde un contexto de resolución de problemas en el que el estudiante debe discriminar la información superflua de aquella que le permite obtener la regla de generación de la serie y resolver la tarea. Diferentes variables como la longitud del núcleo de repetición, el número de descriptores, su naturaleza o la aparición de distractores permiten establecer diferentes grados de complejidad en la tarea. Nuestro objetivo es explorar qué factores relacionados con la complejidad del patrón influyen en la dificultad experimentada por estudiantes de cinco años de Educación Infantil al abordar este tipo de problemas. Los resultados obtenidos nos indican que factores como la aparición de distractores o la repetición de atributos en el núcleo del patrón afectan significativamente a la tasa de éxito, mientras que otros como la longitud del núcleo o el tipo de descriptor, no ofrecen diferencias significativas.

ACS Style

Dionisio Félix Yáñez; Pascual D. Diago; David Arnau. Relación entre complejidad y dificultad en tareas con patrones lineales reiterativos en estudiantes de 5 años. Revista de Educación de la Universidad de Granada 2018, 25, 299 .

AMA Style

Dionisio Félix Yáñez, Pascual D. Diago, David Arnau. Relación entre complejidad y dificultad en tareas con patrones lineales reiterativos en estudiantes de 5 años. Revista de Educación de la Universidad de Granada. 2018; 25 ():299.

Chicago/Turabian Style

Dionisio Félix Yáñez; Pascual D. Diago; David Arnau. 2018. "Relación entre complejidad y dificultad en tareas con patrones lineales reiterativos en estudiantes de 5 años." Revista de Educación de la Universidad de Granada 25, no. : 299.

Journal article
Published: 04 July 2017 in Astronomy & Astrophysics
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We analyzed the star HD 171219, one of the relatively bright Be stars observed in the seismo field of the CoRoT satellite, in order to determine its physical and pulsation characteristics. Classical Be stars are main-sequence objects of mainly B-type, whose spectra show, or have shown at some epoch, Balmer lines in emission and an infrared excess. Both characteristics are attributed to an equatorially concentrated circumstellar disk fed by non-periodic mass-loss episodes (outbursts). Be stars often show nonradial pulsation gravity modes and, as more recently discovered, stochastically excited oscillations. Applying the CLEANEST algorithm to the high-cadence and highly photometrically precise measurements of the HD 171219 light curve led us to perform an unprecedented detailed analysis of its nonradial pulsations. Tens of frequencies have been detected in the object compatible with nonradial g-modes. Additional high-resolution ground-based spectroscopic observations were obtained at La Silla (HARPS) and Haute Provence (SOPHIE) observatories during the month preceding CoRoT observations. Additional information was obtained from low-resolution spectra from the BeSS database. From spectral line fitting we determined physical parameters of the star, which is seen equator-on (i = 90°). We also found in the ground data the same frequencies as in CoRoT data. Additionally, we analyzed the circumstellar activity through the traditional method of violet to red emission Hα line variation. A quintuplet was identified at approximately 1.113 c d-1 (12.88 μHz) with a separation of 0.017 c d-1 that can be attributed to a pulsation degree ℓ ~ 2. The light curve shows six small- to medium-scale outbursts during the CoRoT observations. The intensity of the main frequencies varies after each outburst, suggesting a possible correlation between the nonradial pulsations regime and the feeding of the envelope.

ACS Style

L. Andrade; E. Janot-Pacheco; M. Emilio; Y. Frémat; C. Neiner; E. Poretti; P. Mathias; M. Rainer; Juan Carlos Suárez; K. Uytterhoeven; M. Briquet; Pascual D. Diago; J. Fabregat; J. Gutiérrez-Soto. Photometric and spectroscopic variability of the B5IIIe star HD 171219. Astronomy & Astrophysics 2017, 603, A41 .

AMA Style

L. Andrade, E. Janot-Pacheco, M. Emilio, Y. Frémat, C. Neiner, E. Poretti, P. Mathias, M. Rainer, Juan Carlos Suárez, K. Uytterhoeven, M. Briquet, Pascual D. Diago, J. Fabregat, J. Gutiérrez-Soto. Photometric and spectroscopic variability of the B5IIIe star HD 171219. Astronomy & Astrophysics. 2017; 603 ():A41.

Chicago/Turabian Style

L. Andrade; E. Janot-Pacheco; M. Emilio; Y. Frémat; C. Neiner; E. Poretti; P. Mathias; M. Rainer; Juan Carlos Suárez; K. Uytterhoeven; M. Briquet; Pascual D. Diago; J. Fabregat; J. Gutiérrez-Soto. 2017. "Photometric and spectroscopic variability of the B5IIIe star HD 171219." Astronomy & Astrophysics 603, no. : A41.

Journal article
Published: 02 October 2012 in Astronomy & Astrophysics
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Context. Be stars are rapidly rotating stars with a circumstellar decretion disk. They usually undergo pressure and/or gravity pulsation modes excited by the κ-mechanism, i.e. an effect of the opacity of iron-peak elements in the envelope of the star. In the Milky Way, p-modes are observed in stars that are hotter than or equal to the B3 spectral type, while g-modes are observed at the B2 spectral type and cooler.Aims. We observed a B0IVe star, HD 51452, with the high-precision, high-cadence photometric CoRoT satellite and high-resolution, ground-based HARPS and SOPHIE spectrographs to study its pulsations in great detail. We also used the lower resolution spectra available in the BeSS database.Methods. We analyzed the CoRoT and spectroscopic data with several methods: Clean-NG, FreqFind, and a sliding window method. We also analyzed spectral quantities, such as the violet over red (V/R) emission variations, to obtain information about the variation in the circumstellar environment. We calculated a stellar structure model with the ESTER code to test the various interpretation of the results.Results. We detect 189 frequencies of variations in the CoRoT light curve in the range between 0 and 4.5 c d-1. The main frequencies are also recovered in the spectroscopic data. In particular we find that HD 51452 undergoes gravito-inertial modes that are not in the domain of those excited by the κ-mechanism. We propose that these are stochastic modes excited in the convective zones and that at least some of them are a multiplet of r-modes (i.e. subinertial modes mainly driven by the Coriolis acceleration). Stochastically excited gravito-inertial modes had never been observed in any star, and theory predicted that their very low amplitudes would be undetectable even with CoRoT. We suggest that the amplitudes are enhanced in HD 51452 because of the very rapid stellar rotation. In addition, we find that the amplitude variations of these modes are related to the occurrence of minor outbursts. Conclusions. Thanks to CoRoT data, we have detected a new kind of pulsations in HD 51452, which are stochastically excited gravito-inertial modes, probably due to its very rapid rotation. These modes are probably also present in other rapidly rotating hot Be stars.

ACS Style

C. Neiner; M. Floquet; R. Samadi; Francisco Espinosa Lara; Y. Frémat; S. Mathis; B. Leroy; B. De Batz; Monica Rainer; Ennio Poretti; P. Mathias; J. Guarro Fló; C. Buil; Jose Ribeiro; E. Alecian; L. Andrade; M. Briquet; Pascual D. Diago; M. Emilio; Juan Fabregat; Juan Gutierrez-Soto; A.-M. Hubert; E. Janot-Pacheco; C. Martayan; T. Semaan; J. Suso; J. Zorec. Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452. Astronomy & Astrophysics 2012, 546, A47 .

AMA Style

C. Neiner, M. Floquet, R. Samadi, Francisco Espinosa Lara, Y. Frémat, S. Mathis, B. Leroy, B. De Batz, Monica Rainer, Ennio Poretti, P. Mathias, J. Guarro Fló, C. Buil, Jose Ribeiro, E. Alecian, L. Andrade, M. Briquet, Pascual D. Diago, M. Emilio, Juan Fabregat, Juan Gutierrez-Soto, A.-M. Hubert, E. Janot-Pacheco, C. Martayan, T. Semaan, J. Suso, J. Zorec. Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452. Astronomy & Astrophysics. 2012; 546 ():A47.

Chicago/Turabian Style

C. Neiner; M. Floquet; R. Samadi; Francisco Espinosa Lara; Y. Frémat; S. Mathis; B. Leroy; B. De Batz; Monica Rainer; Ennio Poretti; P. Mathias; J. Guarro Fló; C. Buil; Jose Ribeiro; E. Alecian; L. Andrade; M. Briquet; Pascual D. Diago; M. Emilio; Juan Fabregat; Juan Gutierrez-Soto; A.-M. Hubert; E. Janot-Pacheco; C. Martayan; T. Semaan; J. Suso; J. Zorec. 2012. "Stochastic gravito-inertial modes discovered by CoRoT in the hot Be star HD 51452." Astronomy & Astrophysics 546, no. : A47.

Journal article
Published: 29 October 2010 in Astronomy & Astrophysics
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Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics

ACS Style

M. Emilio; L. Andrade; E. Janot-Pacheco; A. Baglin; Juan Gutierrez-Soto; Juan Carlos Suárez; B. De Batz; Pascual D. Diago; Juan Fabregat; M. Floquet; Y. Frémat; A. L. Huat; A. M. Hubert; Francisco Espinosa Lara; B. Leroy; C. Martayan; C. Neiner; T. Semaan; J. Suso. Photometric variability of the Be star CoRoT-ID 102761769. Astronomy & Astrophysics 2010, 522, A43 .

AMA Style

M. Emilio, L. Andrade, E. Janot-Pacheco, A. Baglin, Juan Gutierrez-Soto, Juan Carlos Suárez, B. De Batz, Pascual D. Diago, Juan Fabregat, M. Floquet, Y. Frémat, A. L. Huat, A. M. Hubert, Francisco Espinosa Lara, B. Leroy, C. Martayan, C. Neiner, T. Semaan, J. Suso. Photometric variability of the Be star CoRoT-ID 102761769. Astronomy & Astrophysics. 2010; 522 ():A43.

Chicago/Turabian Style

M. Emilio; L. Andrade; E. Janot-Pacheco; A. Baglin; Juan Gutierrez-Soto; Juan Carlos Suárez; B. De Batz; Pascual D. Diago; Juan Fabregat; M. Floquet; Y. Frémat; A. L. Huat; A. M. Hubert; Francisco Espinosa Lara; B. Leroy; C. Martayan; C. Neiner; T. Semaan; J. Suso. 2010. "Photometric variability of the Be star CoRoT-ID 102761769." Astronomy & Astrophysics 522, no. : A43.

Book chapter
Published: 25 February 2010 in Protection of Space Materials from the Space Environment
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Stellar pulsations in main-sequence B-type stars are driven by the κ-mechanism due to the Fe-group opacity bump. The current models do not predict the presence of instability strips in the B spectral domain at very low metallicities. As the metallicity of the Magellanic Clouds (MC) has been measured to be around Z = 0. 002 for the Small Magellanic Cloud (SMC) and Z = 0. 007 for the Large Magellanic Cloud (LMC), they constitute a very suitable objects to test these predictions. The aim of this work is to investigate the existence of B-type pulsators at low metallicities, searching for short-term periodic variability in a large sample of B and Be stars from the MC with accurately determined fundamental astrophysical parameters.

ACS Style

P. D. Diago; Juan Gutierrez-Soto; Juan Fabregat; C. Martayan; J. Suso. Pulsating B and Be Stars in the Magellanic Clouds. Protection of Space Materials from the Space Environment 2010, 401 -401.

AMA Style

P. D. Diago, Juan Gutierrez-Soto, Juan Fabregat, C. Martayan, J. Suso. Pulsating B and Be Stars in the Magellanic Clouds. Protection of Space Materials from the Space Environment. 2010; ():401-401.

Chicago/Turabian Style

P. D. Diago; Juan Gutierrez-Soto; Juan Fabregat; C. Martayan; J. Suso. 2010. "Pulsating B and Be Stars in the Magellanic Clouds." Protection of Space Materials from the Space Environment , no. : 401-401.

Journal article
Published: 24 July 2009 in Astronomy & Astrophysics
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Context. HD 181231 is a B5IVe star, which has been observed with the CoRoT satellite during ~5 consecutive months and simultaneously from the ground in spectroscopy and spectropolarimetry.Aims. By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of beating effects possibly at the origin of the Be phenomenon. Our results will also provide a basis for seismic modelling.Methods. The fundamental parameters of the star are determined from spectral fitting and from the study of the circumstellar emission. The CoRoT photometric data and ground-based spectroscopy are analysed using several Fourier techniques: Clean-ng, Pasper, and Tisaft, as well as a time-frequency technique. A search for a magnetic field is performed by applying the LSD technique to the spectropolarimetric data.Results. We find that HD 181231 is a B5IVe star seen with an inclination of ~45 degrees. No magnetic field is detected in its photosphere. We detect at least 10 independent significant frequencies of variations among the 54 detected frequencies, interpreted in terms of non-radial pulsation modes and rotation. Two longer-term variations are also detected: one at ~14 days resulting from a beating effect between the two main frequencies of short-term variations, the other at ~116 days due either to a beating of frequencies or to a zonal pulsation mode.Conclusions. Our analysis of the CoRoT light curve and ground-based spectroscopic data of HD 181231 has led to the determination of the fundamental and pulsational parameters of the star, including beating effects. This will allow a precise seismic modelling of this star.

ACS Style

C. Neiner; Juan Gutierrez-Soto; F. Baudin; B. De Batz; Y. Frémat; A. L. Huat; M. Floquet; A.-M. Hubert; B. Leroy; Pascual D. Diago; Ennio Poretti; F. Carrier; Monica Rainer; C. Catala; O. Thizy; C. Buil; Jose Ribeiro; L. Andrade; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; E. Janot-Pacheco; C. Martayan; T. Semaan; J. Suso; A. Baglin; E. Michel; R. Samadi. The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy. Astronomy & Astrophysics 2009, 506, 143 -151.

AMA Style

C. Neiner, Juan Gutierrez-Soto, F. Baudin, B. De Batz, Y. Frémat, A. L. Huat, M. Floquet, A.-M. Hubert, B. Leroy, Pascual D. Diago, Ennio Poretti, F. Carrier, Monica Rainer, C. Catala, O. Thizy, C. Buil, Jose Ribeiro, L. Andrade, M. Emilio, Francisco Espinosa Lara, Juan Fabregat, E. Janot-Pacheco, C. Martayan, T. Semaan, J. Suso, A. Baglin, E. Michel, R. Samadi. The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy. Astronomy & Astrophysics. 2009; 506 (1):143-151.

Chicago/Turabian Style

C. Neiner; Juan Gutierrez-Soto; F. Baudin; B. De Batz; Y. Frémat; A. L. Huat; M. Floquet; A.-M. Hubert; B. Leroy; Pascual D. Diago; Ennio Poretti; F. Carrier; Monica Rainer; C. Catala; O. Thizy; C. Buil; Jose Ribeiro; L. Andrade; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; E. Janot-Pacheco; C. Martayan; T. Semaan; J. Suso; A. Baglin; E. Michel; R. Samadi. 2009. "The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy." Astronomy & Astrophysics 506, no. 1: 143-151.

Journal article
Published: 22 July 2009 in Astronomy & Astrophysics
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Context. Be stars undergo outbursts producing a circumstellar disk from the ejected material. The beating of non-radial pulsations has been put forward as a possible mechanism of ejection.Aims. We analyze the pulsational behavior of the early B0.5IVe star HD 49330 observed during the first CoRoT long run towards the Galactical anticenter (LRA1). This Be star is located close to the lower edge of the β Cephei instability strip in the HR diagram and showed a 0.03 mag outburst during the CoRoT observations. It is thus an ideal case for testing the aforementioned hypothesis. Methods. We analyze the CoRoT light curve of HD 49330 using Fourier methods and non-linear least square fitting. Results. In this star, we find pulsation modes typical of β Cep stars (p modes) and SPB stars (g modes) with amplitude variations along the run directly correlated with the outburst. These results provide new clues about the origin of the Be phenomenon as well as strong constraints on the seismic modelling of Be stars.

ACS Style

A.-L. Huat; A.-M. Hubert; F. Baudin; M. Floquet; Coralie Neiner; Y. Frémat; Juan Gutierrez-Soto; L. Andrade; B. De Batz; Pascual D. Diago; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; E. Janot-Pacheco; B. Leroy; C. Martayan; T. Semaan; J. Suso; M. Auvergne; C. Catala; E. Michel; R. Samadi. The B0.5IVe CoRoT target HD 49330. Astronomy & Astrophysics 2009, 506, 95 -101.

AMA Style

A.-L. Huat, A.-M. Hubert, F. Baudin, M. Floquet, Coralie Neiner, Y. Frémat, Juan Gutierrez-Soto, L. Andrade, B. De Batz, Pascual D. Diago, M. Emilio, Francisco Espinosa Lara, Juan Fabregat, E. Janot-Pacheco, B. Leroy, C. Martayan, T. Semaan, J. Suso, M. Auvergne, C. Catala, E. Michel, R. Samadi. The B0.5IVe CoRoT target HD 49330. Astronomy & Astrophysics. 2009; 506 (1):95-101.

Chicago/Turabian Style

A.-L. Huat; A.-M. Hubert; F. Baudin; M. Floquet; Coralie Neiner; Y. Frémat; Juan Gutierrez-Soto; L. Andrade; B. De Batz; Pascual D. Diago; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; E. Janot-Pacheco; B. Leroy; C. Martayan; T. Semaan; J. Suso; M. Auvergne; C. Catala; E. Michel; R. Samadi. 2009. "The B0.5IVe CoRoT target HD 49330." Astronomy & Astrophysics 506, no. 1: 95-101.

Journal article
Published: 15 July 2009 in Astronomy & Astrophysics
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Context. The origin of the short-term variability in Be stars remains a matter of controversy. Pulsations and rotational modulation are the components of the favored hypothesis.Aims. We present our analysis of CoRoT data of the B8IIIe star HD 175869 observed during the first short run in the center direction (SRC1).Methods. We review both the instrumental effects visible in the CoRoT light curve and the analysis methods used by the CoRoT Be team. We applied these methods to the CoRoT light curve of the star HD 175869. A search for line-profile variations in the spectroscopic data was also performed. We also searched for a magnetic field, by applying the LSD technique to spectropolarimetric data.Results. The light curve exhibits low-amplitude variations of the order of 300 μmag with a double wave shape. A frequency within the range determined for the rotational frequency and 6 of its harmonics are detected. The main frequency and its first harmonic exhibit amplitude variations of a few days. Other significant frequencies of low-amplitude from 25 to a few μmag are also found. The analysis of line profiles from ground-based spectroscopic data does not detect any variation. In addition, no Zeeman signature was found.Conclusions. Inhomogeneities caused by stellar activity in or just above the photosphere are proposed to produce the photometric variability detected by CoRoT in the Be star HD 175869. The hypothesis that non-radial pulsations are the origin of these variations cannot be excluded.

ACS Style

J. Gutiérrez-Soto; M. Floquet; R. Samadi; Coralie Neiner; R. Garrido; Juan Fabregat; Y. Frémat; Pascual D. Diago; A.-L. Huat; B. Leroy; M. Emilio; A.-M. Hubert; O. Thizy L. Andrade; B. De Batz; E. Janot-Pacheco; Francisco Espinosa Lara; C. Martayan; T. Semaan; J. Suso; M. Auvergne; S. Chaintreuil; E. Michel; C. Catala. Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869. Astronomy & Astrophysics 2009, 506, 133 -141.

AMA Style

J. Gutiérrez-Soto, M. Floquet, R. Samadi, Coralie Neiner, R. Garrido, Juan Fabregat, Y. Frémat, Pascual D. Diago, A.-L. Huat, B. Leroy, M. Emilio, A.-M. Hubert, O. Thizy L. Andrade, B. De Batz, E. Janot-Pacheco, Francisco Espinosa Lara, C. Martayan, T. Semaan, J. Suso, M. Auvergne, S. Chaintreuil, E. Michel, C. Catala. Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869. Astronomy & Astrophysics. 2009; 506 (1):133-141.

Chicago/Turabian Style

J. Gutiérrez-Soto; M. Floquet; R. Samadi; Coralie Neiner; R. Garrido; Juan Fabregat; Y. Frémat; Pascual D. Diago; A.-L. Huat; B. Leroy; M. Emilio; A.-M. Hubert; O. Thizy L. Andrade; B. De Batz; E. Janot-Pacheco; Francisco Espinosa Lara; C. Martayan; T. Semaan; J. Suso; M. Auvergne; S. Chaintreuil; E. Michel; C. Catala. 2009. "Low-amplitude variations detected by CoRoT in the B8IIIe star HD 175869." Astronomy & Astrophysics 506, no. 1: 133-141.

Journal article
Published: 09 July 2009 in Astronomy & Astrophysics
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Context. The presence of pulsations in late-type Be stars is still a matter of controversy. It constitutes an important issue to establish the relationship between non-radial pulsations and the mass-loss mechanism in Be stars.Aims. To contribute to this discussion, we analyse the photometric time series of the B8IVe star HD 50 209 observed by the CoRoT mission in the seismology field.Methods. We use standard Fourier techniques and linear and non-linear least squares fitting methods to analyse the CoRoT light curve. In addition, we applied detailed modelling of high-resolution spectra to obtain the fundamental physical parameters of the star.Results. We have found four frequencies which correspond to gravity modes with azimuthal order with the same pulsational frequency in the co-rotating frame. We also found a rotational period with a frequency of 0.679 cd-1 (7.754 μHz).Conclusions. HD 50 209 is a pulsating Be star as expected from its position in the HR diagram, close to the SPB instability strip.

ACS Style

P. D. Diago; Juan Gutierrez-Soto; M. Auvergne; Juan Fabregat; A.-M. Hubert; M. Floquet; Y. Frémat; R. Garrido; L. Andrade; B. De Batz; M. Emilio; Francisco Espinosa Lara; A.-L. Huat; E. Janot-Pacheco; B. Leroy; C. Martayan; Coralie Neiner; T. Semaan; J. Suso; C. Catala; Ennio Poretti; Monica Rainer; K. Uytterhoeven; E. Michel; R. Samadi. Pulsations in the late-type Be star HD 50 209 detected by CoRoT. Astronomy & Astrophysics 2009, 506, 125 -131.

AMA Style

P. D. Diago, Juan Gutierrez-Soto, M. Auvergne, Juan Fabregat, A.-M. Hubert, M. Floquet, Y. Frémat, R. Garrido, L. Andrade, B. De Batz, M. Emilio, Francisco Espinosa Lara, A.-L. Huat, E. Janot-Pacheco, B. Leroy, C. Martayan, Coralie Neiner, T. Semaan, J. Suso, C. Catala, Ennio Poretti, Monica Rainer, K. Uytterhoeven, E. Michel, R. Samadi. Pulsations in the late-type Be star HD 50 209 detected by CoRoT. Astronomy & Astrophysics. 2009; 506 (1):125-131.

Chicago/Turabian Style

P. D. Diago; Juan Gutierrez-Soto; M. Auvergne; Juan Fabregat; A.-M. Hubert; M. Floquet; Y. Frémat; R. Garrido; L. Andrade; B. De Batz; M. Emilio; Francisco Espinosa Lara; A.-L. Huat; E. Janot-Pacheco; B. Leroy; C. Martayan; Coralie Neiner; T. Semaan; J. Suso; C. Catala; Ennio Poretti; Monica Rainer; K. Uytterhoeven; E. Michel; R. Samadi. 2009. "Pulsations in the late-type Be star HD 50 209 detected by CoRoT." Astronomy & Astrophysics 506, no. 1: 125-131.

Journal article
Published: 02 July 2009 in Astronomy & Astrophysics
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Context. We present spectroscopic ground-based observations of the early Be star HD 49330 obtained simultaneously with the CoRoT-LRA1 run just before the burst observed in the CoRoT data.Aims. Ground-based spectroscopic observations of the early Be star HD 49330 obtained during the precursor phase and just before the start of an outburst allow us to disantangle stellar and circumstellar contributions and identify modes of stellar pulsations in this rapidly rotating star.Methods. Time series analysis (TSA) is performed on photospheric line profiles of and by means of the least squares method.Results. We find two main frequencies = 11.86 c d-1 and = 16.89 c d-1 which can be associated with high order p-mode pulsations. We also detect a frequency = 1.51 c d-1 which can be associated with a low order g-mode. Moreover we show that the stellar line profile variability changed over the spectroscopic run. These results are in agreement with the results of the CoRoT data analysis, as shown in Huat et al. (2009).Conclusions. Our study of mid- and short-term spectroscopic variability allows the identification of p- and g-modes in HD 49330. It also allows us to display changes in the line profile variability before the start of an outburst. This brings new constraints for the seimic modelling of this star.

ACS Style

M. Floquet; A.-M. Hubert; A.-L. Huat; Y. Frémat; E. Janot-Pacheco; Juan Gutierrez-Soto; Coralie Neiner; B. De Batz; B. Leroy; Ennio Poretti; Pedro José Amado; C. Catala; Monica Rainer; D. Diaz; K. Uytterhoeven; L. Andrade; Pascual D. Diago; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; C. Martayan; T. Semaan; J. Suso. The B0.5 IVe CoRoT target HD 49330. Astronomy & Astrophysics 2009, 506, 103 -110.

AMA Style

M. Floquet, A.-M. Hubert, A.-L. Huat, Y. Frémat, E. Janot-Pacheco, Juan Gutierrez-Soto, Coralie Neiner, B. De Batz, B. Leroy, Ennio Poretti, Pedro José Amado, C. Catala, Monica Rainer, D. Diaz, K. Uytterhoeven, L. Andrade, Pascual D. Diago, M. Emilio, Francisco Espinosa Lara, Juan Fabregat, C. Martayan, T. Semaan, J. Suso. The B0.5 IVe CoRoT target HD 49330. Astronomy & Astrophysics. 2009; 506 (1):103-110.

Chicago/Turabian Style

M. Floquet; A.-M. Hubert; A.-L. Huat; Y. Frémat; E. Janot-Pacheco; Juan Gutierrez-Soto; Coralie Neiner; B. De Batz; B. Leroy; Ennio Poretti; Pedro José Amado; C. Catala; Monica Rainer; D. Diaz; K. Uytterhoeven; L. Andrade; Pascual D. Diago; M. Emilio; Francisco Espinosa Lara; Juan Fabregat; C. Martayan; T. Semaan; J. Suso. 2009. "The B0.5 IVe CoRoT target HD 49330." Astronomy & Astrophysics 506, no. 1: 103-110.

Journal article
Published: 02 January 2008 in Astronomy & Astrophysics
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Astronomy & Astrophysics (A&A) is an international journal which publishes papers on all aspects of astronomy and astrophysics

ACS Style

P. D. Diago; Juan Gutierrez-Soto; Juan Fabregat; C. Martayan. Pulsating B and Be stars in the Small Magellanic Cloud. Astronomy & Astrophysics 2008, 480, 179 -186.

AMA Style

P. D. Diago, Juan Gutierrez-Soto, Juan Fabregat, C. Martayan. Pulsating B and Be stars in the Small Magellanic Cloud. Astronomy & Astrophysics. 2008; 480 (1):179-186.

Chicago/Turabian Style

P. D. Diago; Juan Gutierrez-Soto; Juan Fabregat; C. Martayan. 2008. "Pulsating B and Be stars in the Small Magellanic Cloud." Astronomy & Astrophysics 480, no. 1: 179-186.