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Pulsaciones multiperiódicas de una estrella gigante roja despojada en un sistema binario eclipsante
Pierre F L Maxted1, Aldo M Serenelli, Andrea Miglio
1Astrophysics Group, Keele University, Keele, Staffordshire ST5 5BG, UK. p.maxted@keele.ac.uk
Nature
|June 28, 2013
Resumen
Enanas blancas de baja masa.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
Sus antecedentes:
- Las enanas blancas de baja masa son restos de gigantes rojas en sistemas binarios.
- Sus tasas de enfriamiento varían debido a la fusión de hidrógeno, una dicotomía que no se entiende completamente.
- Esto limita su uso como relojes para púlsares o sondas de entornos extremos.
Objetivo del estudio:
- Para medir con precisión la masa y el radio de una enana blanca precursora de baja masa.
- Comprender los factores que influyen en las tasas de enfriamiento de las enanas blancas.
- Para investigar la formación de sistemas estelares binarios exóticos.
Principales métodos:
- Medidas precisas de masa y radio de una enana blanca precursora.
- Modelado estelar para que coincida con los datos de observación.
- Análisis de las frecuencias de pulsación para inferir procesos internos.
Principales resultados:
- La estrella precursora requiere una gruesa envoltura de hidrógeno para que coincida con los datos de observación.
- Enanas blancas muy frías probablemente perdieron sus envolturas a través de la irradiación de púlsares o destellos de proyectiles.
- Se identificó un nuevo tipo de precursor de estrellas pulsantes.
Conclusiones:
- Las gruesas envolturas de hidrógeno son cruciales para la evolución de las enanas blancas de baja masa.
- La irradiación pulsar o la fusión inestable explican la pérdida de envoltura en las enanas blancas frías.
- El análisis de la pulsación ofrece información sobre los fenómenos de los flash de las conchas.
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