The statistical properties of early-type stars from LAMOST DR8

Abstract

Massive binary stars play a crucial role in many astrophysical fields. Investigating the statistical properties of massive binary stars is essential to trace the formation of massive stars and constrain the evolution of stellar populations. However, no consensus has been achieved on the statistical properties of massive binary stars, mainly due to the lack of a large and homogeneous sample of spectroscopic observations. We study the intrinsic binary fraction $f_{\mathrm{b}}^{\mathrm{in}}$ and distributions of mass ratio $f(q)$ and orbital period $f(P)$ of early-type stars (comprised of O-, B-, and A-type stars) and investigate their dependences on effective temperature $T_{\mathrm{eff}}$, stellar metallicity [M/H], and the projection velocity $v\sin i$, based on the homogeneous spectroscopic sample from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release Eight (DR8). We found that $f_{\mathrm{b}}^{\mathrm{in}}$ increases with increasing $T_{\mathrm{eff}}$. The binary fraction is positively correlated with metallicity for spectra in the sample. Over all the $v\sin i$ values we considered, the $f_{\mathrm{b}}^{\mathrm{in}}$ have constant values of $\sim$50\%. It seems that the binary population is relatively evenly distributed over a wide range of $v\sin i$ values, while the whole sample shows that most of the stars are concentrated at low values of $v\sin i$ (probably from strong wind and magnetic braking of single massive stars) and at high values of $v\sin i$ (likely from the merging of binary stars). Stellar evolution and binary interaction may be partly responsible for this.There are no correlations found between $\pi$($\gamma$) and $T_{\mathrm{eff}}$, nor for $\pi$($\gamma$) and [M/H]. The uncertainties of the distribution decrease toward a larger sample size with higher observational cadence.

References in corpus (39)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• The Sloan Digital Sky Survey: Technical Summary
• On the variation of the Initial Mass Function
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• Binary interaction dominates the evolution of massive stars
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• Stellar Multiplicity
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• The First Data Release (DR1) of the LAMOST general survey
• The rotation rates of massive stars: the role of binary interaction through tides, mass transfer and mergers
• LAMOST Experiment for Galactic Understanding and Exploration (LEGUE) The survey science plan
• The VLT-FLAMES Tarantula Survey VIII. Multiplicity properties of the O-type star population
• Identification of A-colored Stars and Structure in the Halo of the Milky Way from SDSS Commissioning Data
• Accretion-powered Stellar Winds as a Solution to the Stellar Angular Momentum Problem
• A spectroscopic survey on the multiplicity of high-mass stars
• On the Role of Disks in the Formation of Stellar Systems: A Numerical Parameter Study of Rapid Accretion
• Toward Complete Statistics of Massive Binary Stars: Penultimate Results from the Cygnus OB2 Radial Velocity Survey
• Evolution towards the critical limit and the origin of Be stars
• The VLT-FLAMES Tarantula Survey XXII. Multiplicity properties of the B-type stars
• Formation Scenario for Wide and Close Binary Systems
• Deriving the stellar labels of LAMOST spectra with Stellar LAbel Machine (SLAM)
• Binary Population Synthesis
• Properties of OB star-black hole systems derived from detailed binary evolution models
• Self-consistent Stellar Radial Velocities from LAMOST Medium-Resolution Survey (MRS) DR7
• Dynamical population synthesis: Constructing the stellar single and binary contents of galactic field populations
• Gravitational instability in protostellar disks at low metallicities
• Stellar loci II. a model-free estimate of the binary fraction for field FGK stars
• Binary Formation with Different Metallicities: Dependence on Initial Conditions
• Multiplicity of Galactic Luminous Blue Variable stars
• Radial velocity measurements from LAMOST medium-resolution spectroscopic observations: A pointing towards the Kepler field
• Towards the field binary population: Influence of orbital decay on close binaries
• Multiplicity and period distribution of Population II field stars in solar vicinity
• Exploring the spectral \textit{information content} in the LAMOST medium-resolution survey (MRS)
• The Binarity of Early-type Stars from LAMOST Medium-resolution Spectroscopic Survey
• Binary Star Fractions from the LAMOST DR4
• Statistical Time-Resolved Spectroscopy: A higher fraction of short-period binaries for metal-rich F-type dwarfs in SDSS
• On the radial velocity calibrations in the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae
• High-Resolution Spectroscopy of Extremely Metal-Poor Stars from SDSS/SEGUE: II. Binary Fraction

Cited by in corpus (7)

• Binary Stars in the New Millennium
• The binary fraction of Blue Horizontal-Branch (BHB) Stars
• An observational study of rotation and binarity of Galactic O-type runaway stars
• A LOFAR sample of luminous compact sources coincident with nearby dwarf galaxies
• The Binary Fraction of B-type Runaway Stars from LAMOST DR8
• Type Ia Supernovae from First-generation Stars
• Identification of false positive double-lined spectroscopic binaries in LAMOST-MRS data due to moonlight contamination