The binarity of Galactic dwarf stars along with effective temperature and metallicity

Abstract

The fraction of binary stars (fb) is one of most valuable tool to probe the star formation and evolution of multiple systems in the Galaxy. We focus on the relationship between fb and stellar metallicity ([Fe/H]) by employing the differential radial velocity (DRV) method and the large sample observed by the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Main-sequence stars from A- to K-types in the third data release (DR3) of LAMOST are selected to estimate fb. Contributions to a profile of DRV from radial velocity (RV) error of single stars (σ) and orbital motion of binary stars are evaluated from the profile of DRV. Finally, we employ 365,911 stars with randomly repeating spectral observations to present a detailed analysis of fb and σin the two-dimensional (2D) space of Teff and [Fe/H]. The A-type stars are more likely to be companions in binary star systems than other stars. Furthermore, the reverse correlation between fb and [Fe/H] can be shown statistically, which suggests that fb is a joint function of Teff and [Fe/H]. At the same time, σof the sample for different Teff and [Fe/H] are fitted. Metal-rich cold stars in our sample have the best RV measurement.

Accepted for publication on MNRAS, 5 pages, 4 figures

References in corpus (7)

• Binary interaction dominates the evolution of massive stars
• The K giant stars from the LAMOST survey data I: identification, metallicity, and distance
• The binarity of Milky Way F,G,K stars as a function of effective temperature and metallicity
• Stellar loci II. a model-free estimate of the binary fraction for field FGK stars
• LAMOST observations in the Kepler field. Analysis of the stellar parameters measured with the LASP based on the low-resolution spectra
• Statistical Time-Resolved Spectroscopy: A higher fraction of short-period binaries for metal-rich F-type dwarfs in SDSS
• Validation of LAMOST Stellar Parameters with the PASTEL Catalog

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