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The ACS survey of Galactic globular clusters: XII. Photometric binaries along the main sequence

Milone, Antonino; Piotto, G; Bedin, L R; Aparicio, A; Anderson, Jay; Sarajedini, A; Marino, Anna; Moretti, A; Davies, M B; Chaboyer, Brian; Dotter, Aaron; Hempel, Maren; Marin-Franch, A; Paust, Nathaniel; Reid, I Neill; Rosenberg, A

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Context. The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. Aims. 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. Methods. We measured the fraction of binaries and the distribution of mass-ratio as a function of radial location within the...[Show more]

dc.contributor.authorMilone, Antonino
dc.contributor.authorPiotto, G
dc.contributor.authorBedin, L R
dc.contributor.authorAparicio, A
dc.contributor.authorAnderson, Jay
dc.contributor.authorSarajedini, A
dc.contributor.authorMarino, Anna
dc.contributor.authorMoretti, A
dc.contributor.authorDavies, M B
dc.contributor.authorChaboyer, Brian
dc.contributor.authorDotter, Aaron
dc.contributor.authorHempel, Maren
dc.contributor.authorMarin-Franch, A
dc.contributor.authorPaust, Nathaniel
dc.contributor.authorReid, I Neill
dc.contributor.authorRosenberg, A
dc.date.accessioned2015-12-13T23:02:13Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/84790
dc.description.abstractContext. The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. Aims. 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. Methods. 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. Results. 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.
dc.publisherSpringer
dc.rightsAuthor/s retain copyright
dc.sourceAstronomy and Astrophysics
dc.subjectKeywords: Absolute luminosity; Binaries: general; Binary fraction; Binary star; Central core; Cluster parameters; Dynamical evolution; Globular clusters; Globular clusters: general; Main parameters; Mass ratio; Radial distributions; Radial locations; Stars: Populat Binaries: general; Globular clusters: general; Stars: Population II; Techniques: photometric
dc.titleThe ACS survey of Galactic globular clusters: XII. Photometric binaries along the main sequence
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume540
dc.date.issued2012
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.ariespublicationf5625xPUB13035
local.type.statusPublished Version
local.contributor.affiliationMilone, Antonino, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationPiotto, G, Università di Padova
local.contributor.affiliationBedin, L R, INAF-Osservatorio Astronomico di Padova
local.contributor.affiliationAparicio, A, Instituto de Astrofìsica de Canarias
local.contributor.affiliationAnderson, Jay, Space Telescope Science Institute
local.contributor.affiliationSarajedini, A, University of Florida
local.contributor.affiliationMarino, Anna, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationMoretti, A, INAF-Osservatorio Astrofisicio di Padova
local.contributor.affiliationDavies, M B, Lund Observatory
local.contributor.affiliationChaboyer, Brian, Dartmouth College
local.contributor.affiliationDotter, Aaron, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHempel, Maren, Universidad Catolica de Chile
local.contributor.affiliationMarin-Franch, A, Instituto de Astrofìsica de Canarias
local.contributor.affiliationPaust, Nathaniel, Space Telescope Science Institute
local.contributor.affiliationReid, I Neill, Space Telescope Science Institute
local.contributor.affiliationRosenberg, A, Departamento de Astrof´ısica
local.bibliographicCitation.startpageA16
local.identifier.doi10.1051/0004-6361/201016384
dc.date.updated2016-02-24T08:44:05Z
local.identifier.scopusID2-s2.0-84855677746
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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