Soft X-Ray Transients as Ultraluminous X-Ray Sources

Details Soft X-Ray Transients as Ultraluminous X-Ray Sources Soft X-Ray Transients as Ultraluminous X-Ray Sources

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pasj...56..347l&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.56, No.2, pp. 347-351

Physics

2

Accretion, Black Hole Physics, Stars: Binaries: Close

Scientific paper

We discuss the possibility that the soft X-ray transient GRS1915 + 105 evolved from a binary similar to V4641Sgr (XTEJ1819 - 254) by conservative mass-transfer, and estimate the possible mass-transfer rates during the evolution. The results indicate that the high mass-transfer rates could explain the high luminosities in ultraluminous X-ray sources. Although the high mass-transfer rates during evolution are accompanied by high luminosities, we find that much of the transferred matter may sweeps accompanying radiation in an adiabatic inflow of super-Eddington accretion. We suggest that soft X-ray transients with evolved companions (initial companion mass > 3 Modot), e.g. GRS 1915 + 105, can be ultraluminous X-ray sources if they are seen through their beaming axis.

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