SIMBAD references

2019ApJ...886..118S - Astrophys. J., 886, 118-118 (2019/December-1)

A population of neutron star ultraluminous X-ray sources with a helium star companion.

SHAO Y., LI X.-D. and DAI Z.-G.

Abstract (from CDS):

It was recently proposed that a significant fraction of ultraluminous X-ray sources (ULXs) actually host a neutron star (NS) accretor. We have performed a systematic study on the NS ULX population in Milky Way-like galaxies, by combining binary population synthesis and detailed stellar evolution calculations. Besides a normal star, the ULX donor can be a helium star (the hydrogen envelope of its progenitor star was stripped during previous common envelope evolution) if the NS is accreting at a super-Eddington rate via Roche lobe overflow. We find that the NS-helium star binaries can significantly contribute to the ULX population, with the overall number of about several in a Milky Way-like galaxy. Our calculations show that such ULXs are generally close systems with orbital period distribution peaked at ∼0.1 day (with a tail up to ∼100 days), and the helium stars have relatively low masses distributing with a maximum probability at ∼1M.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Binary stars - Neutron stars - Stellar evolution - X-ray binary stars

Simbad objects: 9

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