Binary Star Fractions from the LAMOST DR4

Abstract

Stellar systems composed of single, double, triple or high-order systems are rightfully regarded as the fundamental building blocks of the Milky Way. Binary stars play an important role in formation and evolution of the Galaxy. Through comparing the radial velocity variations from multi-epoch observations, we analyze the binary fraction of dwarf stars observed with the LAMOST. Effects of different model assumptions such as orbital period distributions on the estimate of binary fractions, are investigated. The results based on log-normal distribution of orbital periods reproduce the previous complete analyses better than the power-law distribution. We find that the binary fraction increases with $T_{\mathrm{eff}}$ and decreases with [Fe/H]. We first investigate the relation between $\alpha$-elements and binary fraction in such a large sample as the LAMOST. The old stars with high [$\alpha$/Fe] dominate higher binary fraction than young stars with low [$\alpha$/Fe]. At the same mass, former forming stars possess a higher binary fraction than newly forming ones, which may be related with the evolution of the Galaxy.

arXiv comment13 pages, 11 figures, RAA accepted

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• The Gaia-ESO Survey: detection and characterization of single line spectroscopic binaries
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• A Catalog of RV Variable Star Candidates from LAMOST
• The statistical properties of early-type stars from LAMOST DR8
• Binary fractions of G and K dwarf stars based on the Gaia EDR3 and LAMOST DR5: impacts of the chemical abundances
• Discovery of s-process enhanced stars in the LAMOST survey
• A Star-based Method for Precise Wavelength Calibration of the Chinese Space Station Telescope (CSST) Slitless Spectroscopic Survey
• Not that simple: the metallicity dependence of the wide binary fraction changes with separation and stellar mass
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• The Relative Calibration of Radial Velocity for LAMOST Medium Resolution Stellar Spectra
• A method for statistical research on binary stars using radial velocities