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CoRoT mide las oscilaciones y la granulación similares a las solares en estrellas más calientes que el Sol
Eric Michel1, Annie Baglin, Michel Auvergne
1Laboratoire d'Etudes Spatiales et d'Instrumentation Astrophysique (LESIA), Observatoire de Paris, CNRS (UMR 8109)-Université Paris 6 Pierre et Marie Curie-Université Paris 7 Denis Diderot, Place Jules Janssen, F-92195 Meudon, France. Eric.Michel@obspm.fr
Science (New York, N.Y.)
|October 25, 2008
Resumen
El satélite CoRoT estudió las oscilaciones estelares y la granulación en estrellas más calientes que el Sol. Las amplitudes de oscilación fueron más altas, pero por debajo de los valores teóricos, revelando información sobre las capas exteriores estelares.
Área de la Ciencia:
- * Astrofísica estelar y asteroseismología.
- * Investigar el interior estelar y las capas exteriores a través del análisis de oscilación.
Sus antecedentes:
- * La heliosismología utiliza las oscilaciones solares para sondear la estructura interior del Sol.
- * El estudio de las oscilaciones en otras estrellas (asterosismología) presenta desafíos significativos.
- * La misión CoRoT (Convección, Rotación y Tránsitos Planetarios) tenía como objetivo superar estos desafíos.
Objetivo del estudio:
- * Para medir las oscilaciones y la granulación estelar en estrellas de la secuencia principal más calientes que el Sol.
- * Para comparar estas mediciones con predicciones teóricas.
- * Investigar los procesos no adiabáticos que gobiernan las oscilaciones estelares.
Principales métodos:
- * Se utilizaron datos del satélite CoRoT.
- * Amplitudes de oscilación medidas y firmas de granulación estelar.
- * Analizado tres estrellas de la secuencia principal más calientes que el Sol.
Principales resultados:
- * Las amplitudes de oscilación observadas son aproximadamente 1,5 veces mayores que los valores solares.
- * Se midió una granulación estelar hasta tres veces mayor que la del Sol.
- * Se encontró que las amplitudes de oscilación eran aproximadamente un 25% por debajo de las predicciones teóricas.
Conclusiones:
- * Los datos de CoRoT proporcionan información valiosa sobre el interior de las estrellas más calientes que el Sol.
- * Las discrepancias entre las amplitudes observadas y teóricas ofrecen mediciones de no-adiabaticidad.
- * El estudio avanza en la comprensión de los procesos de oscilación en las capas exteriores estelares.
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