The ACS Survey of Galactic Globular Clusters. XII. Photometric Binaries along the Main-Sequence

Abstract

The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. We investigate the properties of main-sequence binaries measured in a uniform photometric sample of 59 Galactic globular clusters that were observed by HST WFC/ACS as a part of the Globular Cluster Treasury project. We measured the fraction of binaries and the distribution of mass-ratio as a function of radial location within the cluster, from the central core to beyond the half-mass radius. We studied the radial distribution of binary stars, and the distribution of stellar mass ratios. We investigated monovariate relations between the fraction of binaries and the main parameters of their host clusters. We found that in nearly all the clusters, the total fraction of binaries is significantly smaller than the fraction of binaries in the field, with a few exceptions only. Binary stars are significantly more centrally concentrated than single MS stars in most of the clusters studied in this paper. The distribution of the mass ratio is generally flat (for mass-ratio parameter q>0.5). We found a significant anti-correlation between the binary fraction in a cluster and its absolute luminosity (mass). Some, less significant correlation with the collisional parameter, the central stellar density, and the central velocity dispersion are present. There is no statistically significant relation between the binary fraction and other cluster parameters. We confirm the correlation between the binary fraction and the fraction of blue stragglers in the cluster.

43 Pages, 52 figures, accepted for publication in A&A

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• Effect of Binary Fraction on Horizontal Branch Morphology under Tidally Enhanced Stellar Wind
• Multiple populations within globular clusters in Early-type galaxies Exploring their effect on stellar initial mass function estimates
• Measuring Resolved Star Formation Histories from High-Precision Color-Magnitude Diagrams with StarFormationHistories.jl
• Half a Million Binary Stars from the low resolution spectra of LAMOST
• New parameters for star cluster dynamics: the effect of primordial binaries and dark remnants
• Signature of a chemical spread in the open cluster M37
• Decoding the bifurcated red-giant branch as a tracer of multiple stellar populations in the young Large Magellanic Cloud cluster NGC 2173
• The Next Generation Virgo Cluster Survey. XVII. A Search for Planetary Nebulae in Virgo Cluster Globular Clusters
• The GeMS/GSAOI Galactic Globular Cluster Survey (G4CS) II: Characterization of 47 Tuc with Bayesian Statistics
• Spectroscopy of Red Giants in the globular cluster Terzan 8: kinematics and evidence for the surrounding Sagittarius stream
• Blue Stragglers in Globular Clusters: Observations, Statistics and Physics
• At what mass are stars braked? The implication from the turnoff morphology of NGC 6819
• The MAVERIC Survey: The first radio and X-ray limits on the detached black holes in NGC 3201
• Studying Binary Systems in Omega Centauri with MUSE. I. Detection of Spectroscopic Binaries
• Is Fornax 4 the nuclear star cluster of the Fornax dwarf spheroidal galaxy?
• The internal kinematics of NGC 2808 and its multiple populations
• Mass transfer of low-mass binaries and chemical anomalies among unevolved stars in globular clusters
• Fewer Companions in the Crowd: The Low Close Binary Fraction in Globular Clusters from Gaia RVS
• Exploring Multiple Stellar Populations in Globular Clusters with Euclid: A Theoretical Overview and Insights from NGC 6397
• A deep HST view of the open cluster NGC2158: binaries, mass functions, and M-dwarf discontinuity
• Unveiling Bifurcated Blue Straggler Sequences in NGC 2173: Insights from Binary Evolution
• Role of host galaxy in the formation of multiple stellar populations: Analysis of NGC 1786 and NGC 1898
• Relation between spectral indices and binary fractions in GCs
• The Small Magellanic Cloud through the lens of the James Webb Space Telescope : binaries and mass function within the galaxy outskirts
• UVIT-HST-Gaia-VISTA study of KRON 3 in the Small Magellanic Cloud: A cluster with an extended red clump in UV
• Rubin Data Preview 1: Extending the View of Unresolved Binary Stars in 47 Tucanae
• Multiple stellar populations at less evolved stages-III: a possible helium spread in NGC 2210
• Determination method of binary fractions by the integrated spectrum
• Searching for chemical abundance variations in young star clusters in the Magellanic Clouds: NGC 411, NGC 1718 and NGC 2213
• Stellar masses and mass ratios for Gaia open cluster members
• Inferring the efficiency of convective-envelope overshooting in Red Giant Branch stars
• A Fermi-LAT Study of Globular Cluster Dynamical Evolution in the Milky Way: Millisecond Pulsars as the Probe
• Effect of dynamical interactions on integrated properties of globular clusters
• PSF-based Analysis for Detecting Unresolved Wide Binaries
• The impact of stellar rotations and binaries on the shape of upper main sequence near turn off in open cluster NGC\,6067
• Discovery of a hot post-AGB star in Galactic globular cluster E3
• Constraining the original composition of the gas forming first-generation stars in globular clusters
• Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4
• Tidal disruptions of close white dwarf binaries by intermediate mass black holes
• Using Binaries in Globular Clusters to Catch Sight of Intermediate-Mass Black Holes
• Quantifying Systematic Age Discrepancies in Very Young Star Clusters
• Evidence for Dynamical Filtering: High Binary Fraction, Hard-binary Excess, and Unresolved Triples in the Surviving Core of NGC 6791
• Photo-chemo-dynamical analysis and the origin of the bulge globular cluster Palomar 6