J/A+A/693/A161ivo://CDS.VizieR/J/A+A/693/A161doi:10.26093/cds/vizier.36930161CDSMuller-Horn J.Gottgens F.Dreizler S.Kamann S.Martens S.,Saracino S.Ye C.S.2025-08-01T20:03:02Z2025-07-23T10:54:36ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frglobular-star-clustersmultiple-starsradial-velocityvisible-astronomySpectroscopic observations of binary stars in globular clusters are essential to shed light on the poorly constrained period, eccentricity, and mass ratio distributions and to develop an understanding of the formation of peculiar stellar objects. 47 Tuc (NGC 104) is one of the most massive Galactic globular clusters, with a large population of blue stragglers and with many predicted but as-yet elusive stellar-mass black holes. This makes it an exciting candidate for binary searches. We present a multi-epoch spectroscopic survey of 47 Tuc with the VLT/MUSE integral field spectrograph to determine radial velocity variations for 21699 stars. We find a total binary fraction in the cluster of (2.4+/-1.0)%, consistent with previous photometric estimates, and an increased binary fraction among blue straggler stars, approximately three times higher than the cluster average. We find very few binaries with periods below three days, and none with massive dark companions. A comparison with predictions from state-of-the-art models shows that the absence of such short-period binaries and of binaries with massive companions is surprising, highlighting the need to improve our understanding of stellar and dynamical evolution in binary systems.2025A&A...693A.161Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/693/A161CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/693/A161https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/693/A161http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/693/A161https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/693/A161https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/693/A161http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/693/A161GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/693/A161/tablea1 (*Properties of the 30 identified binary systems with well-constrained orbits)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A161/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A161/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A161/tablea1?GETtext/xml+votable180.050000true5.9975-72.1090.005555555555555556Cone search capability for table J/A+A/693/A161/params (Binary probabilities, and stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/693/A161/params?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/693/A161/params?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/693/A161/params?GETtext/xml+votable180.050000true6.1855473-72.065508650.0055555555555555566/333212.0401237512456292e-19 3.9057996558789745e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/693/A161?format=asciiOpticaldefaultJ/A+A/693/A161/tablea1*Properties of the 30 identified binary systems with well-constrained orbitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordinteEccentricitysrc.orbital.eccentricityfloatACSACS identifiermeta.id;meta.mainintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainF606WApparent visual magnitude in the F606W filtermagphot.mag;em.opt.RfloatMass1Estimated primary stellar masssolMassphys.massfloatMass2minEstimated minimum companion stellar masssolMassphys.massfloatPerPerioddtime.periodfloatE_PerPeriod error (upper value)dstat.error;stat.maxfloate_PerPeriod error (lower value)dstat.errorfloatKRV semi-amplitudekm/ssrc.var.amplitudefloatE_KRV semi-amplitude (upper value)km/sstat.error;stat.maxfloate_KRV semi-amplitude (lower value)km/sstat.errorfloatE_eEccentricity (upper value)stat.error;stat.maxfloate_eEccentricity (lower value)stat.errorfloatNotesNotes (1)meta.notecharJ/A+A/693/A161/paramsBinary probabilities, and stellar parametersMUSEMUSE identification numbermeta.id;meta.mainintACSACS identifiermeta.idintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000)degpos.eq.dec;meta.mainindexedF606W? F606W magnitudemagphot.mag;em.opt.RfloatnullableF814W? F814W magnitudemagphot.mag;em.opt.IfloatnullableMiso? Isochrone masssolMassphys.massdoublenullablePbinBinary probabilitystat.fit.goodnessdoubleVCShow the Radial Velocity curvesmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/A+A/693/A161/rvsRV time series data for the 21699 sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMUSEMUSE identifiermeta.id;meta.mainintRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordoubleSNRSignal-to-noise ratiostat.snrdoubleJDObservation Julian date of observationdtime.epochdoubleindexed