A. van der Meer
- High-mass X-ray binaries and OB runaway stars
- IAU Colloquium 191, Merida, Yucatan, Mexico
- Book/source title
- Proc. IAU Coll. 191: The Environment and Evolution of Double and Multiple Stars
- Pages (from-to)
- Volume (Publisher)
- Document type
- Conference contribution
- Faculty of Science (FNWI)
- Anton Pannekoek Institute for Astronomy (API)
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 MM⊙. 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.
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