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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

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|March 9, 2007
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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.

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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.