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Formación del binario de agujero negro M33 X-7 a través del intercambio de masas en un sistema masivo apretado
Francesca Valsecchi1, Evert Glebbeek, Will M Farr
1Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208, USA. francesca@u.northwestern.edu
Nature
|October 22, 2010
Resumen
Las simulaciones revelan que el binario masivo de rayos X M33 X-7 es el binario M33 X-7.
Área de la Ciencia:
- La astrofísica es la astrofísica.
- Evolución Estelar Evolución Estelar
- Astronomía de rayos X La astronomía de rayos X es una ciencia.
Sus antecedentes:
- M33 X-7 es un sistema binario masivo de rayos X en la galaxia Messier 33.
- Cuenta con un agujero negro que gira rápidamente y una estrella compañera subluminosa.
- Los modelos existentes no logran explicar su luminosidad de rayos X observada, la subluminosidad del compañero, el giro del agujero negro y la excentricidad orbital.
Objetivo del estudio:
- Para resolver discrepancias en las propiedades observadas del sistema M33 X-7.
- Proponer un modelo evolutivo consistente que explique las características del sistema.
Principales métodos:
- Se realizaron simulaciones de las huellas evolutivas estelares.
- Los modelos exploraron las masas primarias iniciales de 85-99 masas solares y las masas secundarias de 28-32 masas solares.
- Se investigaron los períodos orbitales entre 2,8 y 3,1 días.
Principales resultados:
- Se encontró un modelo consistente donde la estrella primaria transfiere masa a la secundaria y pierde masa a través del viento.
- El primario evolucionó en una estrella de helio, colapsando en un agujero negro.
- Las "patadas" natales de la liberación de energía de unión y las asimetrías de colapso explican la órbita excéntrica; la acreción del viento explica la luminosidad de los rayos X; los procesos natales explican el giro del agujero negro.
Conclusiones:
- El escenario evolutivo propuesto explica con éxito las masas observadas, la luminosidad, el giro y la excentricidad de M33 X-7.
- Este modelo resuelve inconsistencias anteriores en la comprensión de las binarias masivas de rayos X.
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