The mass of the compact object in the X-ray binary her X-1/HZ her |
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| Authors: | M K Abubekerov E A Antokhina A M Cherepashchuk V V Shimanskii |
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| Institution: | (1) Sternberg Astronomical Institute, Universitetskiĭ pr. 13, Moscow, 119899, Russia;(2) Kazan State University, ul. Lenina 18, Kazan, 420008, Tatarstan, Russia |
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| Abstract: | 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 γ absorption line: m x = 1.8 M ⊙ and m v = 2.5 M ⊙. 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 ⊙ and m v = 1.87 ± 0.13 M ⊙. 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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