CoRoT Reveals a Magnetic Activity Cycle in a Sun-Like Star

Bibcode
2010Sci...329.1032G
DOI
10.1126/science.1191064
García, Rafael A.; Mathur, Savita; Salabert, D.; Ballot, Jérôme; Régulo, C.; Metcalfe, Travis S.; Baglin, Annie
Referencia bibliográfica

Science, Volume 329, Issue 5995, pp. 1032- (2010).

Fecha de publicación:
8
2010
Revista
Science
Número de autores
7
Número de autores del IAC
2
Número de citas
269
Número de citas referidas
200
Descripción
The 11-year activity cycle of the Sun is a consequence of a dynamo process occurring beneath its surface. We analyzed photometric data obtained by the CoRoT space mission, showing solarlike oscillations in the star HD49933, for signatures of stellar magnetic activity. Asteroseismic measurements of global changes in the oscillation frequencies and mode amplitudes reveal a modulation of at least 120 days, with the minimum frequency shift corresponding to maximum amplitude as in the Sun. These observations are evidence of a stellar magnetic activity cycle taking place beneath the surface of HD49933 and provide constraints for stellar dynamo models under conditions different from those of the Sun.
Proyectos relacionados
Helio y Astroseismología
Sismología Solar y Estelar y Búsqueda de Exoplanetas
Los objetivos principales de este proyecto son: 1) estudiar la estructura y la dinámica del interior solar, 2) ampliar este estudio a otros tipos de estrellas y 3) buqueda de planetas extrasolares utilizando métodos fotométricos y su caracterización con información complementaria (espectrometría). Para alcanzar el primer objetivo, utilizamos la
Savita
Mathur
En ejecución
Tipo
Con árbitro
Física estelar e interestelar (FEEI)

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