J/AJ/155/51ivo://CDS.VizieR/J/AJ/155/51doi:10.26093/cds/vizier.51550051CDSHillenbrand L.A.Zhang C.Riddle R.L.Baranec C.Ziegler C.Law N.M.,Stauffer J.2018-12-17T11:06:08Z2018-10-17T06:44:47ZCDS support team

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

cds-question@unistra.fropen-star-clustersmultiple-starsinfrared-photometryvisible-astronomyphotometrystellar-massesWe identify and roughly characterize 66 candidate binary star systems in the Pleiades, Praesepe, and NGC 2264 star clusters, based on robotic adaptive optics imaging data obtained using Robo-AO at the Palomar 60" telescope. Only ~10% of our imaged pairs were previously known. We detect companions at red optical wavelengths, with physical separations ranging from a few tens to a few thousands of au. A three-sigma contrast curve generated for each final image provides upper limits to the brightness ratios for any undetected putative companions. The observations are sensitive to companions with a maximum contrast of ~6^m^ at larger separations. At smaller separations, the mean (best) raw contrast at 2" is 3.8^m^ (6^m^), at 1" is 3.0^m^ (4.5^m^), and at 0.5" is 1.9^m^ (3^m^). Point-spread function subtraction can recover nearly the full contrast in the closer separations. For detected candidate binary pairs, we report separations, position angles, and relative magnitudes. Theoretical isochrones appropriate to the Pleiades and Praesepe clusters are then used to determine the corresponding binary mass ratios, which range from 0.2 to 0.9 in q=m_2_/m_1_. For our sample of roughly solar-mass (FGK type) stars in NGC 2264 and sub-solar-mass (K and early M-type) primaries in the Pleiades and Praesepe, the overall binary frequency is measured at ~15.5%+/-2%. However, this value should be considered a lower limit to the true binary fraction within the specified separation and mass ratio ranges in these clusters, given that complex and uncertain corrections for sensitivity and completeness have not been applied.2018AJ....155...51Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/155/51CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)J/A+A/323/139 : K magnitude of Pleiades low-mass binaries (Bouvier+ 1997)J/A+A/329/101 : Masses of Pleiades members (Raboud+ 1998)J/ApJ/521/682 : Binaries in the Praesepe and Coma clusters (Abt+, 1999)J/A+A/375/989 : JHK photometry of Praesepe low-mass stars (Bouvier+, 2001)J/AJ/123/1570 : alpha Persei and Praesepe Clusters (Patience+, 2002)J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002)J/MNRAS/342/1241 : Low-mass stars in M45 and M44 (Pinfield+, 2003)J/AJ/134/2340 : Membership of Praesepe and Coma Berenices clustersJ/ApJS/172/663 : Infrared observations of the Pleiades (Stauffer+, 2007)J/MNRAS/380/712 : ZYJHK photometry in Pleiades (Lodieu+, 2007)J/MNRAS/422/1495 : UKIDSS Galactic Clusters Survey Pleiades membersJ/MNRAS/426/3419 : UKIDSS GCS Praesepe members (Boudreault+, 2012)J/MNRAS/430/1433 : NGC 2264 members periods with CoRoT (Affer+, 2013)J/MNRAS/434/3236 : Masses of Praesepe members (Khalaj+, 2013)J/A+A/563/A45 : Pleiades cluster membership probabilities (Sarro+, 2014)J/ApJ/784/57 : Photometry and proper motions in Praesepe (Wang+, 2014)J/A+A/577/A148 : The Seven Sisters DANCe. I. Pleiades (Bouy+, 2015)J/ApJ/799/4 : Robo-AO observations of binary stars (Riddle+, 2015)J/AJ/152/113 : Pleiades members with K2 light curves. I. PeriodsJ/ApJ/821/8 : Spectroscopic binary population of ONC and NGC2264J/AJ/153/66 : Robo-AO Kepler Planetary Candidate Survey. III.J/ApJ/839/92 : Praesepe members with K2 light curve data (Rebull+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/155/51https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/155/51http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/155/51https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/155/51https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/155/51http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/155/51GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/155/51/table1 (Characteristics of Observed Targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/155/51/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/155/51/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/155/51/table1?GETtext/xml+votable180.050000true58.5371924.333640.0055555555555555565/113 115 116 118 121 1174 1177 1180 6/359 361 363 366 367 377 378 379 381 382 405 439 449 450 451 457 458 468 476 478 480 481 496 1152 1155 4686 4687 4691 4700 4703 4717 4724 4726 4728 23637 236398.650015785639275e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/155/51?format=asciiOpticalInfrareddefaultJ/AJ/155/51/table1Characteristics of Observed TargetsSimbadNameSimbad column added by the CDSmeta.idcharClusterCluster identifiermeta.id.parentcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetTarget identifier (1)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainVmag[11.74/17.45]? Apparent V band magnitudemagphot.mag;em.opt.VfloatnullableIcmag[10.89/23.44]? Apparent I_C_ band magnitudemagphot.mag;em.opt.IfloatnullableJmag[9.52/13.72] Apparent 2MASS J band magnitudemagphot.mag;em.IR.JfloatKsmag[8.48/12.94] Apparent 2MASS K_s_ band magnitudemagphot.mag;em.IR.KfloatMultiRobo-AO multiplicitymeta.code.multipcharFWHM[2.2/52.8]? Adopted Full-Width at Half-Maximum point-spread function (PSF) (2)pixspect.line.widthfloatnullableC0.5[0.31/3.07]? Robo-AO contrast differential magnitude at 0.5" separationmagpos.angDistance;arith.difffloatnullableC1[0.75/4.61]? Robo-AO contrast differential magnitude at 1" separationmagpos.angDistance;arith.difffloatnullableC2[1.21/6.04]? Robo-AO contrast differential magnitude at 2" separationmagphot.mag;arith.difffloatnullableC3[1.27/6.78]? Robo-AO contrast differential magnitude at 3" separationmagphot.mag;arith.difffloatnullableJ/AJ/155/51/table2Basic Characteristics of Detected BinariesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster identifiermeta.id.parentcharBinaryBinary identifiermeta.id;meta.maincharsigma[3.5/30.5] Significance for companion detection {sigma} (1)stat.likelihood;obsfloatSep[0.23/6.14] Projected separationarcsecpos.angDistancefloatPA[0.4/356.1] Position angledegpos.posAngfloatBr[0.27/4.62] Optical brightness ratiomagphot.flux;arith.ratiofloate_Br[0.03/0.76] Uncertainty in Brmagstat.errorfloatl_M2/M1[<] Limt flag on M2/M1meta.code.errorcharM2/M1[0.17/0.93]? Mass ratio M_2_/M_1_phys.massfloatnullable