J/ApJ/835/152ivo://CDS.VizieR/J/ApJ/835/152doi:10.26093/cds/vizier.18350152CDSChaboyer B.McArthur B.E.O'Malley E.Benedict G.F.Feiden G.A.,Harrison T.E.McWilliam A.Nelan E.P.Patterson R.J.Sarajedini A.2017-10-26T12:49:04Z2017-09-18T08:20:21ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsvisible-astronomytrigonometric-parallaxproper-motionshst-photometryinterferometryastrometryHubble Space Telescope (HST) fine guidance sensor observations were used to obtain parallaxes of eight metal-poor ([Fe/H]< -1.4) stars. The parallaxes of these stars determined by the new Hipparcos reduction average 17% accuracy, in contrast to our new HST parallaxes, which average 1% accuracy and have errors on the individual parallaxes ranging from 85 to 144{mu}as. These parallax data were combined with HST Advanced Camera for Surveys photometry in the F606W and F814W filters to obtain the absolute magnitudes of the stars with an accuracy of 0.02-0.03 mag. Six of these stars are on the main sequence (MS) (with -2.7<[Fe/H]< -1.8) and are suitable for testing metal-poor stellar evolution models and determining the distances to metal-poor globular clusters (GCs). Using the abundances obtained by O'Malley+ (2017ApJ...838...90O), we find that standard stellar models using the VandenBerg & Clem (2003AJ....126..778V) color transformation do a reasonable job of matching five of the MS stars, with HD 54639 ([Fe/H]=-2.5) being anomalous in its location in the color-magnitude diagram. Stellar models and isochrones were generated using a Monte Carlo analysis to take into account uncertainties in the models. Isochrones that fit the parallax stars were used to determine the distances and ages of nine GCs (with -2.4{<=}[Fe/H]{<=}-1.9). Averaging together the age of all nine clusters led to an absolute age of the oldest, most metal-poor GCs of 12.7+/-1.0Gyr, where the quoted uncertainty takes into account the known uncertainties in the stellar models and isochrones, along with the uncertainty in the distance and reddening of the clusters.2017ApJ...835..152Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/835/152CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)I/254 : The HST Guide Star Catalog, Version 1.2 (Lasker+ 1996)VII/195 : Globular Clusters in the Milky Way (Harris, 1996)I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)I/317 : The PPMXL Catalog (Roeser+ 2010)I/320 : SPM 4.0 Catalog (Girard+, 2011)I/337 : Gaia DR1 (Gaia Collaboration, 2016)J/AJ/107/2240 : Proper motion stars survey. XII. (Carney+, 1994)J/A+A/359/347 : Reddening in open and globular clusters (Dutra+, 2000)J/A+A/445/939 : Metal-poor stars uvby-beta photometry. XI. (Schuster+, 2006)J/ApJ/715/1203 : {upsilon} Andromedae system with HST (McArthur+, 2010)J/AJ/142/187 : HST observations of 7 Pop.II variable stars (Benedict+, 2011)J/A+A/575/A26 : Properties of Population II star HD 140283 (Creevey+, 2015)J/ApJ/812/149 : HSTPROMO. III. Dynamical distances (Watkins+, 2015)J/AJ/151/160 : 1103 parallaxes and proper motions from URAT (Finch+, 2016)J/ApJ/831/L6 : Eclipsing binary parallaxes with Gaia data (Stassun+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/835/152https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/835/152http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/835/152https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/835/152https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/835/152http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/835/152GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/835/152/stars (Metal-poor target star parallaxes, proper motions and general properties (tables 2-4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/835/152/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/835/152/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/835/152/stars?GETtext/xml+votable180.050000true141.0873911-80.52258250.005555555555555556Cone search capability for table J/ApJ/835/152/table11 (Astrometric data for the 8 targets and reference stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/835/152/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/835/152/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/835/152/table11?GETtext/xml+votable180.050000true167.79796.6215640.0055555555555555566/7518 13487 13829 14677 14679 15658 27122 27128 29451 29596 29598 30553 36919https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/835/152?format=asciiOpticaldefaultJ/ApJ/835/152/starsMetal-poor target star parallaxes, proper motions and general properties (tables 2-4)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIP[46120/108200] HIP numbermeta.id;meta.mainintNoNumber of HST observations for this target (table 11)meta.numberintnullablePlx[3.4/15.1] HST parallaxmaspos.parallax.trigfloate_Plx[0.08/0.2] Plx uncertaintymasstat.error;pos.parallaxfloatPlxH07[9.5/16] HIP parallax (Cat. I/311)maspos.parallax.trigfloate_PlxH07[0.9/3] PlxH07 uncertaintymasstat.errorfloatPlxT17[2.4/15]? TGAS parallax (Cat. I/337/tgas)maspos.parallax.trigfloatnullablee_PlxT17[0.2/0.9]? PlxT17 uncertaintymasstat.errorfloatnullablepmRA[-567.1/760.7] {mu}_R.A._ from HSTmas/yrpos.pm;pos.eq.radoublee_pmRA[0.07/0.2] pmRA uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-625.6/1236.4] {mu}_Decl._ from HSTmas/yrpos.pm;pos.eq.decdoublee_pmDE[0.08/0.2] pmDE uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatpmRAH07[-568/763] HIP proper motion along RAmas/yrpos.pm;pos.eq.rafloate_pmRAH07[1/4] pmRAH07 uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatpmDEH07[-627/1237] HIP proper motion along DECmas/yrpos.pm;pos.eq.decfloate_pmDEH07[1/3] pmDEH07 uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatpmRAPP[-382/762] PPMXL {mu}_R.A._ (Cat. I/317)mas/yrpos.pm;pos.eq.rafloate_pmRAPP[1/9] pmRAPP uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatpmDEPP[-630/1238] PPMXL {mu}_Decl._mas/yrpos.pm;pos.eq.decfloate_pmDEPP[1/7] pmDEPP uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatVmag[10/11.6] V-band magnitude (Vega system)magphot.mag;em.opt.VfloatV-I[0.7/1] (V-I) color indexmagphot.color;em.opt.V;em.opt.IfloatE(B-V)[0/0.2] Color excess (1)magphot.color.excessfloat(V-I)0[0.6/1] Dereddened (V-I) color indexphot.color;em.opt.V;em.opt.IfloatVMag[3.9/6.7] Absolute V-band magnitude (M_V_)magphot.mag;em.opt.Vfloate_VMag[0.01/0.1] VMag uncertaintymagstat.error;phot.mag;em.opt.VfloatF606W[3.7/6.4] F606W absolute magnitude (M_F606W_) (2)magphys.magAbsfloat[Fe/H][-2.7/-1.4] [Fe/H] abundance (1)phys.abund.Fefloat[a/Fe][0.01/0.7] [{alpha}/Fe] abundance (1)(3)phys.abundfloatPPMXLDisplay the PPMXL catalog data (I/317) within 0.5"meta.ref.urlintnullableT17Display data from the Gaia DR1 TGAS catalog (I/337) for this targetmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/ApJ/835/152/table11Astrometric data for the 8 targets and reference starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintobsIDHST Observation ID (Dataset)meta.id;obscharModeHST observing mode; POSITION or TRANSFERinstr.setupcharPIDRaw target ID from proposal (Proposal ID)meta.id;obslongStar[1/580] Star number of observation from proposalmeta.id;obsintpVmag[10/16] Predicted V band magnitudemagphot.mag;em.opt.VfloatVmag[9.5/16.2] Actual V band magnitudemagphot.mag;em.opt.VfloatRApdegPredicted Right Ascension (J2000)degpos.eq.raDEpdegPredicted Declination (J2000)degpos.eq.decRAJ2000Right Ascension of V1 telescope axis (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of V1 telescope axis (J2000)degpos.eq.dec;meta.mainrollV3Roll about V3 of telescopedeginstr.offsetdoubleXposX position of telescopekmpos.cartesian.xdoubleYposY position of telescopekmpos.cartesian.ydoubleZposZ position of telescopekmpos.cartesian.zdoubleXvelX velocity of telescopekm/sphys.veloc;pos.cartesian.xdoubleYvelY velocity of telescopekm/sphys.veloc;pos.cartesian.ydoubleZvelZ velocity of telescopekm/sphys.veloc;pos.cartesian.zdoubleJDObservation Julian Date; correcteddtime.epochdoubleMJDModified Julian observation timedtime.epochdoubleObs[2008/2011] Year of observationstime.epochAstro[1] FGS used as the astrometer (always "1")meta.codeintFilt[F583W] Filter used for observation (always F583W)instr.setup;instr.filtercharSet[1/12] Set number of observation groupmeta.numberintE+Xvel[0] Earth plus HST X velocitykm/sphys.velocintE+Yvel[0] Earth plus HST Y velocitykm/sphys.velocintE+Zvel[0] Earth plus HST Z velocitykm/sphys.velocintXaveUncorrected X position calculated by averagearcsecpos.cartesian.x;instr.detdoubleYaveUncorrected Y position calculated by averagearcsecpos.cartesian.y;instr.detdoublee_Xave[0.001/0.6] Standard deviation in Xavearcsecstat.errordoublee_Yave[0.001/0.02] Standard deviation in Yavearcsecstat.errordoubleXYcorXY correlationarcsecstat.correlationdoubleXYcovXY covariancearcsecstat.covariancedoubleXmedUncorrected X position calculated by medianarcsecpos.cartesian.x;instr.detdoubleYmedUncorrected Y position calculated by medianarcsecpos.cartesian.y;instr.detdoubleXmad[0.001/0.2] X median average deviationarcsecstat.errordoubleYmad[0.0009/0.007] Y median average deviationarcsecstat.errordoubleexptm[20/124] Seconds of FINELOCK datastime.expodoublenpix[829/4969] Number of samples from FINELOCK intervalmeta.numberintVLabSiInstrument velocity aberration measured from HST/FGS-1r (always FGS1r)stat.errorcharVLabFGS[1] FGS velocity aberration measured fromstat.errorintXVLabX position of velocity aberrationarcsecpos.eqdoubleYVLabY position of velocity aberrationarcsecpos.eqdoubleDom-GS[2/3] Dominant FGS guiderinstr.paramintpmtsum[40/11825] Sum of pmtsinstr.paramdoublepmtxapmt from channel xainstr.paramdoublepmtxbpmt from channel xbinstr.paramdoublepmtyapmt from channel yainstr.paramdoublepmtybpmt from channel ybinstr.paramdoubleS-bckgd[100] Number of samples for backgroundmeta.numberintNSamX[0/1733] Number of samples for walkdown pmt diff/sum in X axismeta.numberintxfld/s[-0.6/0.3] X pmt diff/sum from fine lock dv intervalinstr.paramfloatxwdd/s[-1/0.2] X pmt diff/sum from walkdown intervalinstr.paramfloatk1x[0.01/0.04] Reference X axis S_curve inverse slope of Upgren69stat.fit.paramfloatxdiff[-1/0.004] X centroid shift in arcseconds; add to Xmedarcsecpos.angDistancedoubleNSamY[87/4322] Number of samples for walkdown pmt diff/sum in Y axismeta.numberintyfld/s[-0.4/0.02] Y pmt diff/sum from fine lock dv intervalinstr.paramfloatywdd/s[-1/-0.08] Y pmt diff/sum from walkdown intervalinstr.paramfloatk1y[0.01/0.05] Reference Y axis S_curve inverse slope of Upgren69stat.fit.paramfloatydiff[-1/0.005] Y centroid shift in arcseconds; add to Ymedarcsecpos.angDistancedoublectXCourse track X positionarcsecpos.eqdoublectYCourse track Y positionarcsecpos.eqfloatssAmedStar selector position; theta Aarcsecinstr.paramintssBmedStar selector position; theta Barcsecinstr.paramintXvarVariance of Xarcsecstat.variancedoubleYvarVariance of Yarcsecstat.variancedoubleXmvar[/0.02] Median average deviation variance of Xarcsecstat.variancedoubleYmvarMedian average deviation variance of Yarcsecstat.variancedoublessA1Predicted star selector position; theta Ainstr.paramdoublessB1Predicted star selector position; theta Binstr.paramdoubleintrhoAInterpolated rhoA lever arminstr.paramdoubleintkAInterpolated kA lever arminstr.paramdoubleQ1Spacecraft quaternioninstr.paramdoubleQ2Spacecraft quaternioninstr.paramdoubleQ3Spacecraft quaternioninstr.paramdoubleQ4Spacecraft quaternioninstr.paramdoublePalpha[-3.5/2.3] Parallax factor {alpha}arith.factor;pos.parallaxdoublePdelta[-1/1.1] Parallax factor {delta}arith.factor;pos.parallaxdoubleXsinfit[-0.003/0.002] Sinfit position correction for Xarcsecstat.errordoubleXfcqcFinal X corrected position with polynomial drift correctionarcsecarith.factor;pos.cartesian.xdoubleYfcqcFinal Y corrected positionarcsecpos.cartesian.y;instr.detdoubleHIPTarget name (HIP number)meta.id;meta.mainint