J/ApJ/817/40ivo://CDS.VizieR/J/ApJ/817/40doi:10.26093/cds/vizier.18170040CDSFeuillet D.K.Bovy J.Holtzman J.Girardi L.MacDonald N.,Majewski S.R.Nidever D.L.2017-10-18T08:24:44Z2016-04-26T15:32:16ZCDS support team

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

cds-question@unistra.frabsolute-magnitudestellar-agesinfrared-astronomyspectroscopyeffective-temperaturechemical-abundancesWe present a sample of 705 local giant stars observed using the New Mexico State University 1m telescope with the Sloan Digital Sky Survey-III/Apache Point Observatory Galactic Evolution Experiment (APOGEE) spectrograph, for which we estimate stellar ages and the local star formation history (SFH). The high-resolution (R~22500), near infrared (1.51-1.7{mu}m) APOGEE spectra provide measurements of stellar atmospheric parameters (temperature, surface gravity, [M/H], and [{alpha}/M]). Due to the smaller uncertainties in surface gravity possible with high-resolution spectra and accurate Hipparcos distance measurements, we are able to calculate the stellar masses to within 30%. For giants, the relatively rapid evolution up the red giant branch allows the age to be constrained by the mass. We examine methods of estimating age using both the mass-age relation directly and a Bayesian isochrone matching of measured parameters, assuming a constant SFH. To improve the SFH prior, we use a hierarchical modeling approach to constrain the parameters of the model SFH using the age probability distribution functions of the data. The results of an {alpha}-dependent Gaussian SFH model show a clear age-[{alpha}/M] relation at all ages. Using this SFH model as the prior for an empirical Bayesian analysis, we determine ages for individual stars. The resulting age-metallicity relation is flat, with a slight decrease in [M/H] at the oldest ages and a ~0.5 dex spread in metallicity across most ages. For stars with ages <~1Gyr we find a smaller spread, consistent with radial migration having a smaller effect on these young stars than on the older stars.2016ApJ...817...40Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/817/40CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/272 : RAVE 4th data release (Kordopatis+, 2013)V/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)J/A+A/562/A71 : Abundances of solar neighbourhood dwarfs (Bensby+, 2014)J/ApJ/764/78 : Oxygen abundances in nearby FGK stars (Ramirez+, 2013)J/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)J/MNRAS/367/1329 : Elemental abundances for 176 stars (Reddy+, 2006)J/A+AS/102/603 : Chemical evolution of the galactic disk II. (Edvardsson+ 1993)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/817/40https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/817/40http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/817/40https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/817/40https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/817/40http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/817/40GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/817/40/table1 (Parameters of the local sample of giants)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/817/40/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/817/40/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/817/40/table1?GETtext/xml+votable180.050000true0.428708324.25308330.0055555555555555566/8 124 155 236 291 292 312 433 439 490 583 595 628 670 745 749 836 915 923 957 1001 1116 1177 1178 1183 1218 1262 1282 1360 1371 1495 1526 1577 1682 1751 1877 1885 1894 1998 2025 2028 2038 2047 2130 2193 2207 2273 2433 2541 2560 2619 2664 2722 2728 2822 2828 2936 3023 3071 3219 3240 3335 3385 3423 3536 3560 3570 3749 3755 3777 3809 3878 3943 3958 3975 3993 4001 4004 4008 4016 4123 4150 4201 4296 4321 4345 4358 4415 4437 4544 4559 4594 4643 4801 4923 5015 5038 5059 5175 5343 5349 5362 5366 5382 5384 5388 5413 5439 5482 5569 5634 5694 5789 5826 5833 5862 5931 5953 5985 6015 6023 6041 6053 6067 6103 6116 6117 6118 6125 6147 6198 6201 6204 6224 6251 6385 6393 6437 6486 6544 6603 6706 6715 6807 6831 6862 6929 6930 7058 7114 7131 7136 7177 7178 7250 7337 7343 7373 7422 7466 7487 7517 7527 7536 7558 7591 7609 7660 7700 7711 7725 7744 7747 7795 7876 7907 7958 7983 8007 8010 8022 8056 8080 8101 8105 8116 8118 8337 8423 8495 8580 8704 8719 8785 8791 9078 9085 9105 9160 9191 9197 9221 9232 9233 9244 9338 9350 9399 9477 9502 9524 9559 9599 9644 9645 9675 9751 9774 9792 9799 9810 9818 9841 9859 9887 9916 9941 9951 9996 10069 10084 10140 10165 10224 10245 10266 10271 10321 10333 10504 10555 10559 10644 10666 10766 10926 11074 11085 11136 11154 11181 11227 11247 11278 11297 11309 11414 11432 11485 11492 11512 11518 11521 11534 11556 11594 11610 11618 11647 11656 11659 11676 11780 11792 11795 11814 11883 11951 11966 11975 11987 12001 12011 12022 12023 12030 12031 12057 12099 12126 12148 12174 12181 12194 12216 12219 12271 12429 12477 12522 12574 12646 12654 12655 12682 12735 12809 12835 12948 12956 12974 13002 13079 13131 13210 13247 13290 13369 13396 13475 13606 13757 13821 13852 13962 13990 13991 14020 14109 14174 14178 14199 14206 14221 14234 14259 14305 14440 14466 14523 14535 14624 14630 14657 14659 14705 14743 14766 14767 14810 14841 14844 14882 15007 15039 15052 15054 15082 15127 15145 15160 15170 15180 15220 15227 15269 15280 15297 15317 15402 15434 15447 15457 15469 15489 15574 15646 15661 15671 15686 15719 15743 15778 15779 15796 15819 15841 15865 15901 15928 15929 15987 16003 16018 16024 16050 16155 16167 16189 16197 16203 16257 16296 16889 16895 17121 17179 17190 17197 17285 17296 17299 17363 17368 17391 17452 17479 17501 17502 17552 17602 17633 17645 17675 17732 17751 17782 17783 17811 17902 17959 18004 18088 18166 18184 18256 18376 18379 18426 18675 18679 18845 18888 18891 18966 18972 19047 19189 19263 19283 19401 19441 19467 19589 19672 19718 19769 19793 19797 19799 19881 19931 19965 20015 20062 20234 20250 20276 20279 20309 20322 20334 20456 21223 21233 21274 21286 21307 21317 21328 21342 21466 21477 21747 21757 21765 21768 21769 21771 21814 21822 21907 21941 22074 22218 22249 22274 22279 22323 22356 22476 22513 22518 22575 22680 22711 22734 22752 22798 22828 22841 22843 22932 22940 23017 23024 23048 23082 23086 23108 23126 23128 23223 23278 23365 23448 23479 23525 23526 23563 23587 23597 23645 23702 23711 23753 23782 23822 23843 23871 24010 24109 24215 24223 24300 24374 24464 25081 25452 25512 25567 25588 25614 25684 25706 25768 25806 25816 25822 25843 25852 25891 25940 25942 26058 26105 26127 26137 26138 26172 26287 26311 26417 26419 26475 26538 26562 26567 26623 26825 26853 26942 26985 27076 27132 27192 27194 27240 27336 27386 27390 27395 27404 27444 27586 27621 27650 27661 27677 27752 27892 27953 27955 28008 28009 28014 28077 28148 28149 28173 28358 28446 28620 28634 28659 29556 29682 29800 29892 29997 30022 30029 30064 30099 30100 30274 30328 30330 30343 30363 30544 30831 30989 31138 31297 31310 31378 31408 31445 31517 31531 31614 31619 31676 31832 31998 32023 32102 32115 32147 32226 32452 32497 32501 32509 32580 32600 32674 32716 32754 36326 36579 36679 36689 36692 36727 36788 36836 36856 40670 40690 40716 40749 40897 40952 40959 44522 44771 44847 44859 44867 48925 49130https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/817/40?format=asciiInfrareddefaultJ/ApJ/817/40/table1Parameters of the local sample of giantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharHIPHipparcos Catalog identifiermeta.idintTeff[3895/5349] Effective temperatureKphys.temperature.effectiveinte_Teff[92] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[0.7/3.8] Surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)[0.11] Uncertainty in log(g)log(cm.s**-2)stat.errorfloat[M/H][-1/0.6] Metallicityphys.abund.Zfloate_[M/H][0.05] Uncertainty in [M/H]stat.error;phys.abundfloat[a/M][-0.04/0.3] Alpha element abundancepos.eq.rafloate_[a/M][0.05] Uncertainty in [alpha/M]stat.errorfloatVTMag[-3.1/4.3] Absolute Tycho V magnitudemagphys.magAbsfloate_VTMag[0.02/0.3] Uncertainty in VTMagmagstat.error;phot.mag;em.opt.VfloatMass[0.4/24] Derived masssolMassphys.massfloate_Mass[0.1/8] Uncertainty in masssolMassstat.error;phys.massfloatAgeM[8/10.2] log age derived from mass-age relationlog(yr)time.agefloate_AgeM[0.3/0.5] Uncertainty in AgeMlog(yr)stat.errorfloatAgeB[8/10.1] log age from Bayesian analysislog(yr)time.agefloate_AgeB[0/0.4] Uncertainty in AgeBlog(yr)stat.errorfloatAgeE[8.1/10.1] log age from empirical Bayesian analysislog(yr)time.agefloate_AgeE[0/0.5] Uncertainty in AgeElog(yr)stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.main