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Spectral Classification and Estimation of Distances to the Be/X-Ray Binaries 1H1936+541 and 1H2202+501

  • PHYSICS OF STARS AND INTERSTELLAR MEDIUM
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Abstract

The results of the spectral and photometric studies of two Be/X-ray binaries, 1H1936+541 and 1H2202+501, are presented. The spectral class of the optical component of the 1H1936+541 system was determined for the first time, and the spectral class of the optical component of the 1H2202+501 system was refined. According to the results, the optical components of the systems 1H1936+541 and 1H2202+501 are Be stars of the spectral types B1Ve and B3Ve, respectively. These findings, as well as the well-known spectral type distribution of Be stars, can testify to the fact that the object 1H1936+541 belongs to X-ray binary systems. At the same time, taking into account the fact that a very small number of Be/X-ray binaries of the spectral type B3 is known so far, the object 1H2202+501 cannot unambiguously be classified as a Be/X-ray binary. The rotational speeds of the main components of these systems are 246 ± 11 km/s for 1H1936+541 and 111 ± 8 km/s for1H2202+501; the range of the tilt angles of their rotation axes is within 49°–82° and 21°–28°, respectively. Additionally, using the B and V band photometric observations and spectral classes obtained, the interstellar extinction values E(В – V), as well as the distances to the objects, were estimated. In particular, for 1H2202+501, the value of E(В – V) is 0.36 ± 0.03m, and the distance r ranges from 0.8 to 1.6 kpc. For the 1H1936+541 system, the following values were obtained: E(В – V) = 0.23 ± 0.03m and r = 2.1–3.6 kpc. The comparison of the distances to the objects with the data from the GAIA DR2 catalog (http://gea.esac.esa.int/archive/) revealed the coincidence of the corresponding values within the limits of errors.

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  1. Milliarcsecond

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ACKNOWLEDGMENTS

We are grateful to the staffs of the Special Astrophysical Observatory of the Russian Academy of Sciences and Sternberg Astronomical Institute of the Moscow State University for providing observational material and would like to personally thank N.V. Borisov for the spectra, E.A. Barsukova for the help with their processing, and V.N. Ivchenko for valuable scientific consultations.

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Authors and Affiliations

  1. Taras Shevchenko National University of Kyiv, Kyiv, Ukraine

    A. O. Simon & V. V. Vasylenko

  2. Sternberg Astronomical Institute, Moscow State University, Moscow, Russia

    N. V. Metlova

  3. International Center for Astronomical, Medical, and Ecological Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    V. G. Godunova

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  1. A. O. Simon
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  2. N. V. Metlova
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  3. V. G. Godunova
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  4. V. V. Vasylenko
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Correspondence to A. O. Simon or V. G. Godunova.

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Translated by M. Chubarova

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Simon, A.O., Metlova, N.V., Godunova, V.G. et al. Spectral Classification and Estimation of Distances to the Be/X-Ray Binaries 1H1936+541 and 1H2202+501. Kinemat. Phys. Celest. Bodies 35, 38–45 (2019). https://doi.org/10.3103/S0884591319010069

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