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Variabilidad de los rayos X en el supergigante caliente gran Orionis
Science (New York, N.Y.)
|September 16, 1994
Resumen
Las estrellas masivas calientes, cruciales para las mediciones de distancias galácticas, rara vez muestran variabilidad de rayos X. Los investigadores observaron un aumento único en el flujo de rayos X de 2 días en zeta Orionis, proporcionando evidencia directa de gas calentado por choque en los vientos estelares.
Área de la Ciencia:
- La astronomía y la astrofísica.
- Física estelar Física estelar es la física estelar.
- Astronomía de rayos X La astronomía de rayos X es una ciencia.
Sus antecedentes:
- Las estrellas masivas calientes son vitales para determinar las distancias extragalácticas debido a su alta luminosidad.
- Estas estrellas pierden masa a través de vientos impulsados por la radiación, lo que influye en la evolución química galáctica.
- Mientras que las fuentes de rayos X son típicamente estables, la variabilidad es poco común en estrellas calientes.
Objetivo del estudio:
- Para analizar un inusual aumento del flujo de rayos X en la supergigante caliente Zeta Orionis.
- Para investigar el fenómeno de la variabilidad de rayos X en estrellas calientes.
- Para proporcionar evidencia directa del gas calentado por choque en los vientos estelares.
Principales métodos:
- Observación mediante el satélite del Observatorio Roentgen.
- Análisis de los datos de flujo de rayos X durante un período de 2 días.
- Comparación de la variabilidad observada con el comportamiento típico de las estrellas calientes.
Principales resultados:
- Se detectó un aumento sin precedentes en el flujo de rayos X de 2 días en zeta Orionis.
- Este evento representa la única variabilidad de rayos X observada en una estrella caliente hasta la fecha.
- Los hallazgos ofrecen apoyo directo a los mecanismos de calentamiento por choque en los vientos de estrellas calientes.
Conclusiones:
- La variabilidad de rayos X observada en zeta Orionis desafía la noción de emisión estable de rayos X en estrellas calientes.
- Este evento proporciona una fuerte evidencia de gas calentado por choque dentro de los vientos de las estrellas masivas.
- Un estudio más profundo de tales fenómenos es crucial para comprender la evolución estelar y la dinámica galáctica.
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