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On the Evolutionary State of High-Latitude Variable V534 Lyr

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Abstract

Based on the high spectral resolution monitoring conducted at the 6-m BTA telescope, we study the optical spectrum of the high-latitude variable V534 Lyr. Heliocentric radial velocities Vr corresponding to the positions of all metal absorption components, as well as the Na I D and Hα lines were measured during all the observational sets. The analysis of the velocity field examining the lines of various nature revealed a low-amplitude variability of Vr based on the lines with a high excitation potential, which are formed in deep layers of the stellar atmosphere, and allowed to estimate the systemic velocity of Vsys ≈ −125 kms−1 (Vlsr ≈ −105 kms−1). The distance estimate of d ≈ 6 kpc for the star leads to its absolute magnitude of \(M_V \approx - 5_ \cdot ^m 3\), what corresponds to the spectral classification. The previously undetected spectral phenomenon was revealed for this star: at certain times a splitting of the profiles of low-excited absorptions is observed, reaching ΔVr = 20–50 kms−1. A combination of the parameters: reduced metallicity [Met/H]⊙ = −0.28, high nitrogen abundance [N/Fe] = +1.10, large spatial velocity, high luminosity, a strong variability of the emission-absorption profiles of HI lines, splitting of metal absorptions at different times of observations and the variability of the velocity field in the atmosphere allow to classify V534 Lyr as a pulsating star in the thick disk of our Galaxy.

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Authors and Affiliations

  1. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, 369167, Russia

    V. G. Klochkova, E. G. Sendzikas & E. L. Chentsov

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  1. V. G. Klochkova
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  2. E. G. Sendzikas
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  3. E. L. Chentsov
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Correspondence to V. G. Klochkova.

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Original Russian Text © V.G. Klochkova, E.G. Sendzikas, E.L. Chentsov, 2018, published in Astrofizicheskii Byulleten’, 2018, Vol. 73, No. 1, pp. 54–68.

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Klochkova, V.G., Sendzikas, E.G. & Chentsov, E.L. On the Evolutionary State of High-Latitude Variable V534 Lyr. Astrophys. Bull. 73, 52–65 (2018). https://doi.org/10.1134/S1990341318010042

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