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Journal Articles Communications of the Byurakan Astrophysical Observatory Year : 2022

First Byurakan Spectral Survey. Late-Type Stars. Dwarfs

Abstract

A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectral plates. A systematic search and selection were carried out on a surface of ∼16 000 deg^2 on almost the whole area of the FBS. Since 2007, all FBS low-resolution spectral plates have been digitized. The second version of the "Revised and Updated Catalogue of the First Byurakan Survey of Late-Type Stars", containing data for 1471 M and C (carbon) stars (130 C-type giants, 1105 M - giants, and 236 M dwarfs) was generated. Among the 236 M dwarfs selected, 176 are new discoveries. The Gaia EDR3 G broad-band magnitudes are in the range 11.3 < G < 17.1. New distance information by Bailer-Jones et al. (2021), which is based on the EDR3 parallaxes are used to estimate the G-band absolute magnitudes for M dwarfs. 9 FBS M dwarfs (out of 176 new discovered) lie within 25 pc of the Sun. The object FBS 0909-082 is more distant (r = 780 ̇pc) M dwarf among the sample considered, for which G-band absolute magnitude M(G) = 9.18, M = 0.59 MSun, L = 0.13597 L_sun, and T_eff = 3844 K. This object can be classified as M1-M2 sub-type dwarf. The nearest object is FBS 0250+167, a M7 subtype dwarf with very high proper motion (5.13 arcsec/yr) and is located at 3.83 pc from the Sun. The TESS estimated masses lie in the range 095 (±0.02) M_sun ≤ M ≤ 0.7 (± 0.1) M_sun and T_eff in the range 4000K < T_eff < 2790K for FBS M dwarfs. Color-absolute magnitude (CaMD) diagrams are constructed for the FBS M dwarfs based on Gaia EDR3 and TESS data.
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Dates and versions

insu-03993000 , version 1 (16-02-2023)

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K. S. Gigoyan, K. K. Gigoyan, Alain Sarkissian, G. R. Kostandyan, E. Karapetyan, et al.. First Byurakan Spectral Survey. Late-Type Stars. Dwarfs. Communications of the Byurakan Astrophysical Observatory, 2022, 69 (2), pp.207-216. ⟨10.52526/25792776-22.69.2-207⟩. ⟨insu-03993000⟩
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