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High-Mass X-Ray Binaries and OB Runaway Stars

Published online by Cambridge University Press:  22 February 2018

L. Kaper ,
A. Van der Meer  and
A.H. Tijani
L. Kaper
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands ([email protected])
A. Van der Meer
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands ([email protected])
A.H. Tijani
Affiliation:
Astronomical Institute “Anton Pannekoek”, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands ([email protected])

Abstract

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High-mass X-ray binaries (HMXBs) represent an important phase in the evolution of massive binary systems and provide fundamental information on the properties of the OB-star primaries and their compact secondaries (neutron star, black hole). Recent observations indicate that the neutron stars in some of these systems (Vela X-1, 4U 1700-37) are more massive than the canonical mass of 1.35 M⊙. These observations have important consequences for the equation of state at supranuclear densities and the formation mechanism(s) of neutron stars and black holes: supernovae and gamma-ray bursts. As a consequence of the supernova explosion that produced the compact star in these systems, HMXBs have high space velocities and thus are runaways. Alternatively, OB-runaway stars can be ejected from a cluster through dynamical interactions. Observations obtained with the Hipparcos satellite indicate that both scenarios are at work.

Resumen

Resumen

Las binarias masivas de rayos X (HMXBs) representan una fase evolutiva importante, y proporcionan información sobre las propiedades de las primarias OB y de las secundarias compactas (estrellas de neutrones, agujeros negros). Observaciones recientes indican que las estrellas de neutrones en algunos sistemas (Vela X-1, 4U 1700-37) tienen masas mayores que la masa canónica 1.35 M⊙. Estas observaciones tienen consecuencias importantes para la ecuación de estado a densidades supranucleares y para la formación de estrellas de neutrones y agujeros negros (supernovas y estallidos de rayos gama). A consecuencia de la explosión de supernova que produjo el objeto compacto, las HMXBs tienen velocidades espaciales altas, y son desbocadas. Alternativamente, las desbocadas OB pueden ser expelidas de un cúmulo mediante interacciones dinámicas. Las observaciones del Hipparcos indican que ambos mecanismos entran en juego.

Keywords

BinariesGeneral — StarsNeutron — StarsSupergiants
Type
Observational Results for Very Young Binaries
Information
International Astronomical Union Colloquium , Volume 191: The Environment and Evolution of Double and Multiple Stars , August 2004 , pp. 128 - 131
Copyright
Copyright © Instituto de Astronomia – Mexico 2004

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