MASS RATIO AND ECCENTRICITY DISTRIBUTIONS OF YOUNG SPECTROSCOPIC BINARY STARS

O. V. Eretnova; Еретнова О. В.

doi:10.31857/S0004629923090049

MASS RATIO AND ECCENTRICITY DISTRIBUTIONS OF YOUNG SPECTROSCOPIC BINARY STARS

Authors: Eretnova O.V.¹
Affiliations:
1. Chelyabinsk State University
Issue: Vol 100, No 9 (2023)
Pages: 800-810
Section: Articles
URL: https://rjsvd.com/0004-6299/article/view/647573
DOI: https://doi.org/10.31857/S0004629923090049
EDN: https://elibrary.ru/ZKIFBI
ID: 647573

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Abstract

We collected the information about 83 pre-main sequence double-lined spectroscopic binaries. Among them there are Ae/Be Herbig stars, T Tauri stars and red dwarfs. The eccentricity – period relation, the mass ratio and eccentricity distributions of young spectroscopic binaries are constructed and analyzed. The overwhelming majority of close binaries with $P < 10^{d}$ have eccentricity near to zero, the stars less than 1 million years old are rare among them. The mass ratio distribution of systems with $P < 10^{d}$ has a prominent maximum in a range of $q = 0.9 - 1.0$ . The number of young spectroscopic binaries with $P > 10^{d}$ does not decrease with decreasing mass ratio as sharply as in the case of close binary stars, about 12% of these stars have $q < 0.5$ . The paper is based on a talk presented at the astrophysical memorial seminar “Novelties in Understanding the Evolution of Binary Stars”, dedicated to the 90th anniversary of Professor M.A. Svechnikov.

Keywords

pre-main sequence stars, spectroscopic binaries, mass ratio distribution, eccentricity distribution

About the authors

O. V. Eretnova

Chelyabinsk State University

Author for correspondence.
Email: eretnova@csu.ru
Russia, Chelyabinsk

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