CAOSP abstracts, Volume: 55, No.: 3, year: 2025

Author(s): Guo, Y.; Liu, C.; Wang, L.; Wang, J.; Zhang, B.; Ji, K.; Han, Z.; Chen, X.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 55, no. 3, p. 421-424.
Date: 04/2025
Title: The multiplicity properties of early-type stars from LAMOST DR8
Keyword(s): Statistical-catalogs-surveys-early-type-binaries-rotation
Pages: 421 -- 424
DOI: https://doi.org/10.31577/caosp.2025.55.3.421
NASA ADS Abstract Service: 2025CoSka..55c.421G
Citation:
License: This work is licensed under a Creative Commons Attribution 4.0 International License

Abstract: Massive binary stars are key to understanding stellar formation and evolution. To explore the intrinsic binary fraction (f_bⁱⁿ), mass ratio distribution (f(q)), and orbital period distribution (f(P)) of early-type stars (O/B/A-types), we analyze a homogeneous spectroscopic sample of 886 stars from LAMOST DR8, each with more than six observations. These stars are classified based on effective temperature (T_eff), metallicity ([M/H]), and projected rotational velocity (vsini). Monte Carlo simulations were applied to correct for observational biases. Results show that the intrinsic binary fraction increases with T_eff and metallicity, while remaining relatively constant across vsini. For stars in groups of B8-A, B4-B7, O-B3, the binary fractions are f_bⁱⁿ=48% ± 10%, 60% ± 10%, and 76% ± 10%, respectively.