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Una estrella binaria enana blanca de pulsaciones de radio

T R Marsh1, B T Gänsicke1, S Hümmerich2,3

  • 1Department of Physics, Gibbet Hill Road, University of Warwick, Coventry CV4 7AL, UK.

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|July 28, 2016
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Resumen
Este resumen es generado por máquina.

Descubrimos AR Scorpii, un sistema binario de enanas blancas único que emite a través del espectro electromagnético. Esta enana blanca magnética

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Área de la Ciencia:

  • * Astronomía y astrofísica
  • * Estrellas compactas
  • * Sistemas binarios

Sus antecedentes:

  • * Las enanas blancas son restos estelares densos del tamaño de la Tierra.
  • * Por lo general emiten radiación UV a casi IR.
  • * En binarios, la transferencia de masa puede causar emisión de rayos X e IR, pero la detección de infrarrojos lejanos / radio es rara.

Objetivo del estudio:

  • * Para informar sobre el descubrimiento de una enana blanca / estrella fría binaria que emite desde rayos X hasta longitudes de onda de radio.
  • * Para caracterizar las inusuales propiedades de emisión del sistema AR Scorpii.

Principales métodos:

  • * Observaciones de varias longitudes de onda (de rayos X a radio).
  • * Análisis de las curvas de luz y de las propiedades espectrales.
  • * Determinación de los períodos orbitales y de giro.

Principales resultados:

  • * El descubrimiento de AR Scorpii, un sistema binario de período de 3.56 horas.
  • * Pulsaciones intensas y rápidas (período de 1,97 min) detectadas a través de frecuencias ópticas y de radio.
  • * La potencia de giro hacia abajo de la enana blanca excede significativamente la salida electromagnética, lo que indica la dominación de la potencia de giro.
  • * Espectro de banda ancha consistente con la radiación de sincrotrón, que requiere electrones relativistas.

Conclusiones:

  • * AR Scorpii es una enana blanca magnética binaria impulsada principalmente por su espín.
  • * Las pulsaciones, impulsadas por el giro de la enana blanca, se originan principalmente de la estrella compañera fría.
  • * Los electrones relativistas son cruciales para la emisión de sincrotrones observada, probablemente generada cerca de la enana blanca o en la estrella M.