The Mass of the Compact Object in the X-Ray Binary Her X-1/HZ Her

Details The Mass of the Compact Object in the X-Ray Binary Her X-1/HZ Her The Mass of the Compact Object in the X-Ray Binary Her X-1/HZ Her

2012-01-26

arxiv.org/abs/1201.5519v1

Astronomy Reports, 2008, Vol.52, pp.379-389

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

20 pages, 4 tables, 8 figures

Scientific paper

We have obtained the first estimates of the masses of the components of the Her X-1/HZ Her X-ray binary system taking into account non-LTE effects in the formation of the H_gamma absorption line: mx=1.8Msun and mv=2.5Msun. These mass estimates were made in a Roche model based on the observed radial-velocity curve of the optical star, HZ Her. The masses for the X-ray pulsar and optical star obtained for an LTE model lie are mx=0.85\pm0.15Msun and mv=1.87\pm0.13Msun. These mass estimates for the components of Her X-1/HZ Her derived from the radial-velocity curve should be considered tentative. Further mass estimates from high-precision observations of the orbital variability of the absorption profiles in a non-LTE model for the atmosphere of the optical component should be made.

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