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The Herbig Be Star IL Cep A as a Long-Periodic Spectroscopic Binary

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Abstract—

The results of long-term spectral monitoring of the Herbig Be star IL Cep A are presented. A smooth variation in the parameters of the Нα and Нβ line emission component has been discovered. The helium absorption lines He I λ4922 and 5876 Å show seasonal changes, however, these changes do not correlate with changes in hydrogen emission. The radial velocities of the narrow lines D Na I and DIB λ5780, 5796 Å correspond to that of the interstellar medium. The hydrogen emission lines are apparently formed in a triple system, including a close pair of B stars and a remote low-mass K–A component. The orbital elements of this system were calculated using an approximate spectral binary model, where a close pair of massive B stars was considered as one massive component. The rationale for this approach for determining the elements of the orbit is given. The orbital period P = 3550 ± 28 days is determined and some other parameters of the orbit are estimated.

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Funding

This work was supported by the Science Development Foundation of the President of the Azerbaijan Republic (project EIF-BGM-4-RFTF-1/2017-21/07/1), as well as the Russian Foundation for Basic Research (project 18-52-06004_Az).

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Authors and Affiliations

  1. Tusi Shamakha Astrophysical Observatory, National Academy of Sciences of Azerbaijan, AZ 5626, Pirqulu Settlement, Shamakha region, Azerbaijan

    N. Z. Ismailov, U. Z. Bashirova & G. R. Bahaddinova

  2. Main (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, 196140, St. Petersburg, Russia

    M. A. Pogodin

Authors
  1. N. Z. Ismailov
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  2. M. A. Pogodin
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  3. U. Z. Bashirova
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  4. G. R. Bahaddinova
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Correspondence to N. Z. Ismailov.

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Translated by E. Seifina

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Ismailov, N.Z., Pogodin, M.A., Bashirova, U.Z. et al. The Herbig Be Star IL Cep A as a Long-Periodic Spectroscopic Binary. Astron. Rep. 64, 23–33 (2020). https://doi.org/10.1134/S1063772920010047

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  • DOI: https://doi.org/10.1134/S1063772920010047

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