Journal or Publication Title:

Բյուրականի աստղադիտարանի հաղորդումներ: Երևանի աստղադիտարանի բյուլետեն = Сообщения Бюраканской обсерватории. Бюллетень ереванской Астрономической обсерватории = Contributions from the Burakan observatory. Bulletin of the Erevan astronomical observatory

Date of publication:

2022

Volume:

69

Number:

2

ISSN:

2579-2276

Coverage:

207-216

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 deg2 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= 0.59MSun, L=0.13597 LSun, and Teff = 3844 K. This object can be classified as M1-M2 subtype 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 0.095 (±0.02)M⊙ ≤M≤0.7 (±0.1)M⊙ and Teff in the range 4000K < Teff < 2790K for FBSM dwarfs. Color-absolute magnitude (CaMD) diagrams are constructed for the FBSM dwarfs based on Gaia EDR3 and TESS data.

Format:

pdf

Identifier:

oai:arar.sci.am:359478

Language:

en

General note:

Communications of the Byurakan Astrophysical Observatory (ComBAO) is a peer-reviewed scientific journal, which publishes research in observational and theoretical astronomy/astrophysics and presents recent advances in these fields. It is being published by the NAS RA V. Ambartsumian Byurakan Astrophysical Observatory (BAO) in English in electronic form. The journal publishes original papers, review papers, brief reports, book reviews, special communications, observational and theoretical results in various fields of astronomy and related sciences, and some editorial notes, including anniversaries and obituaries. Under the heading “Legacy”, the renewed magazine will republish some old articles of high value in English. The heading “Guest articles” will bring to the attention of readers the articles of researchers who are not employees of BAO. ComBAO was founded in 1946 and regularly published in 1946-1990. However, the publication was interrupted because of the economic situation after the disintegration of the Soviet Union in 1991.

Location of original object:

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