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Un antiguo caparazón de nova alrededor de la enana nova Z Camelopardalis
Michael M Shara1, Christopher D Martin, Mark Seibert
1Department of Astrophysics, American Museum of Natural History, 79th Street and Central Park West, New York, New York 10024-5192, USA. mshara@amnh.org
Nature
|March 9, 2007
Resumen
Una capa masiva alrededor de la enana nova Z Camelopardalis sugiere que ha sufrido una erupción de nova clásica. Este hallazgo vincula las novas enanas con el proceso clásico de nova, desafiando la comprensión previa de las variables cataclísmicas.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Evolución Estelar Evolución Estelar
- Las variables cataclísmicas.
Sus antecedentes:
- Las variables cataclísmicas son sistemas binarios con una enana blanca que acumula materia de una enana roja compañera.
- Las novas enanas exhiben un brillo episódico debido a la inestabilidad del disco de acreción.
- Las novas clásicas son más luminosas, con erupciones termonucleares y eyección de masa.
Objetivo del estudio:
- Para investigar la naturaleza de la cubierta extendida que rodea a la prototípica enana nova Z Camelopardalis.
- Para determinar si el caparazón proporciona evidencia observacional que vincula las novas enanas con los eventos de novas clásicas.
Principales métodos:
- Observación y análisis de la concha extendida que rodea a Z. camelopardalis.
- Estimación de la masa del material del caparazón.
- Comparación de las propiedades de la concha con las de las novas clásicas y otros fenómenos astrofísicos.
Principales resultados:
- Un caparazón excepcionalmente extendido, significativamente más grande que los que se encuentran típicamente alrededor de las novas clásicas, fue detectado alrededor de Z. Camelopardalis.
- La masa derivada del caparazón es consistente con la esperada de una erupción de nova clásica.
- La masa del caparazón es inconsistente con los orígenes de los vientos de nova enana o las nebulosas planetarias.
Conclusiones:
- La concha observada proporciona una fuerte evidencia observacional de que Z Camelopardalis ha experimentado una erupción de nova clásica.
- Este descubrimiento vincula la prototípica enana nova Z Camelopardalis con el fenómeno clásico de la nova.
- Los hallazgos apoyan la teoría de que las enanas blancas en las novas enanas pueden eventualmente acumular suficiente masa para someterse a erupciones de novas clásicas.
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