Journal
ASTRONOMY REPORTS
Volume 52, Issue 5, Pages 379-389Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063772908050041
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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: m(x) = 1.8 M-circle dot and m(v) = 2.5 M-circle dot. 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 m(x) = 0.85 +/- 0.15 M (circle dot) and m(v) = 1.87 +/- 0.13 M-circle dot. 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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