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The mass of the compact object in the X-ray binary her X-1/HZ her

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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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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskiĭ pr. 13, Moscow, 119899, Russia

    M. K. Abubekerov, E. A. Antokhina & A. M. Cherepashchuk

  2. Kazan State University, ul. Lenina 18, Kazan, 420008, Tatarstan, Russia

    V. V. Shimanskii

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  1. M. K. Abubekerov
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  2. E. A. Antokhina
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  3. A. M. Cherepashchuk
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  4. V. V. Shimanskii
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Original Russian Text © M.K. Abubekerov, E.A. Antokhina, A.M. Cherepashchuk, V.V. Shimanskii, 2008, published in Astronomicheskiĭ Zhurnal, 2008, Vol. 85, No. 5, pp. 427–438.

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Abubekerov, M.K., Antokhina, E.A., Cherepashchuk, A.M. et al. The mass of the compact object in the X-ray binary her X-1/HZ her. Astron. Rep. 52, 379–389 (2008). https://doi.org/10.1134/S1063772908050041

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  • DOI: https://doi.org/10.1134/S1063772908050041

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