Stellar loci II. a model-free estimate of the binary fraction for field FGK stars

Abstract

We propose a Stellar Locus OuTlier (SLOT) method to determine the binary fraction of main-sequence stars statistically. The method is sensitive to neither the period nor mass-ratio distributions of binaries, and able to provide model-free estimates of binary fraction for large numbers of stars of different populations in large survey volumes. We have applied the SLOT method to two samples of stars from the SDSS Stripe 82, constructed by combining the re-calibrated SDSS photometric data with respectively the spectroscopic information from the SDSS and LAMOST surveys. For the SDSS spectroscopic sample, we find an average binary fraction for field FGK stars of $41$. The fractions decrease toward late spectral types, and are respectively $44$, $43$, $35$, and $28$ for stars of $g-i$ colors between 0.3 -- 0.6, 0.6 -- 0.9, 0.9 -- 1.2, and 1.2 - 1.6\,mag. A modest metallicity dependence is also found. The fraction decreases with increasing metallicity. For stars of [Fe/H] between $-0.5$ - 0.0, $-1.0$ - $-0.5$, $-1.5$ - $-1.0$, and $-2.0$ - $-1.5$\,dex, the inferred binary fractions are $37$, $39$, $50$, and $53$, respectively. We have further divided the sample into stars from the thin disk, the thick disk, the transition zone between them, and the halo. The results suggest that the Galactic thin and thick disks have comparable binary fractions, whereas the Galactic halo contains a significantly larger fraction of binaries. Applying the method to the LAMOST spectroscopic sample yields consistent results. Finally, other potential applications and future work with the method are discussed.

arXiv comment23 pages, 25 figures, 5 tables, ApJ in press

References in corpus (40)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• The Sloan Digital Sky Survey: Technical Summary
• Evolution of binary stars and the effect of tides on binary populations
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• The Dartmouth Stellar Evolution Database
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• Stellar Multiplicity
• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• GAIA: Composition, Formation and Evolution of the Galaxy
• The Milky Way Tomography with SDSS: II. Stellar Metallicity
• The High Angular Resolution Multiplicity of Massive Stars
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• Stellar SEDs from 0.3-2.5 Microns: Tracing the Stellar Locus and Searching for Color Outliers in SDSS and 2MASS
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• A Catalog of Multiplicity among Bright Stellar Systems
• Empirical extinction coefficients for the GALEX, SDSS, 2MASS and WISE passbands
• SDSS Standard Star Catalog for Stripe 82: the Dawn of Industrial 1% Optical Photometry
• The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters
• Post Common Envelope Binaries from SDSS. I: 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
• The SEGUE Stellar Parameter Pipeline. IV. Validation with an Extended Sample of Galactic Globular and Open Clusters
• Disk and Halo Wide Binaries from the Revised Luyten Catalog: Probes of Star Formation and MACHO Dark Matter
• The SEGUE Stellar Parameter Pipeline. V. Estimation of Alpha-Element Abundance Ratios From Low-Resolution SDSS/SEGUE Stellar Spectra
• The statistical properties of stars and their dependence on metallicity: the effects of opacity
• Discovery of Two Very Low-Mass Binaries: Final Results of an Adaptive Optics Survey of Nearby M6.0-M7.5 Stars
• The binary fractions in the massive young Large Magellanic Cloud star clusters NGC 1805 and NGC 1818
• Binary frequency of very young brown dwarfs at separations smaller than 3 AU
• A survey for low mass spectroscopic binary stars in the young clusters around sigma Orionis and lambda Orionis
• The binarity of Milky Way F,G,K stars as a function of effective temperature and metallicity
• A New Brown Dwarf Desert? A Scarcity of Wide Ultracool Binaries
• Candidate Disk Wide Binaries in the Sloan Digital Sky Survey
• Binary Formation with Different Metallicities: Dependence on Initial Conditions
• Multiplicity and period distribution of Population II field stars in solar vicinity
• Cool Subdwarf Investigations II: Multiplicity
• HST search for M subdwarf binaries
• The Metallicity of Stars with Close Companions
• An Isochrone Database and a Rapid Model for Stellar Population Synthesis
• The binary fraction of the young cluster NGC 1818 in the Large Magellanic Cloud
• Lucky Imaging of M subdwarfs
• White dwarf-main sequence binaries identified from the LAMOST pilot survey
• Binary Contamination in the SEGUE sample: Effects on SSPP Determinations of Stellar Atmospheric Parameters

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