J/AJ/167/50ivo://CDS.VizieR/J/AJ/167/50doi:10.26093/cds/vizier.51670050CDSSchonhut-Stasik J.Zinn J.C.Stassun K.G.Pinsonneault M.,Johnson J.A.Warfield J.T.Stello D.Elsworth Y.Garcia R.A.,Mathur S.Mosser B.Hon M.Tayar J.Stringfellow G.S.Beaton R.L.,Jonsson H.Minniti D.2026-02-10T20:04:21Z2024-07-02T08:04:01ZCDS support team

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

cds-question@unistra.frgiant-starsvisible-astronomystellar-massesstellar-radiieffective-temperaturetrigonometric-parallaxchemical-abundancesWe present a catalog of fundamental stellar properties for ~7500 evolved stars, including stellar radii and masses, determined from the combination of spectroscopic observations from the Apache Point Observatory Galactic Evolution Experiment, part of the Sloan Digital Sky Survey IV, and asteroseismology from K2. The resulting APO-K2 catalog provides spectroscopically derived temperatures and metallicities, asteroseismic global parameters, evolutionary states, and asteroseismically derived masses and radii. Additionally, we include kinematic information from Gaia. We investigate the multidimensional space of abundance, stellar mass, and velocity with an eye toward applications in Galactic archaeology. The APO-K2 sample has a large population of low-metallicity stars (~288 with [M/H]<~-1), and their asteroseismic masses are larger than astrophysical estimates. We argue that this may reflect offsets in the adopted fundamental temperature scale for metal-poor stars rather than metallicity-dependent issues with interpreting asteroseismic data. We characterize the kinematic properties of the population as a function of {alpha} enhancement and position in the disk and identify those stars in the sample that are candidate components of the Gaia-Enceladus merger. Importantly, we characterize the selection function for the APO-K2 sample as a function of metallicity, radius, mass, {nu}_max_, color, and magnitude referencing Galactic simulations and target selection criteria to enable robust statistical inferences with the catalog.2024AJ....167...50Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)I/345 : Gaia DR2 (Gaia Collaboration, 2018)III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)III/286 : APOGEE-2 DR17 final allStar catalog (Abdurro'uf+, 2022)J/A+A/410/527 : Abundances in the Galactic disk (Bensby+, 2003)J/AJ/128/1177 : Galactic stellar abundances (Venn+, 2004)J/A+A/497/497 : Physical parameters from JHKflux (Gonzalez-Hernandez+, 2009)J/AJ/146/133 : Star parameters from SDSS-III APOGEE DR10 (Meszaros+, 2013)J/ApJ/765/L41 : Asteroseismic classification of KIC objects (Stello+, 2013)J/ApJS/215/19 : APOKASC catalog of Kepler red giants (Pinsonneault+, 2014)J/AJ/151/144 : ASPCAP weights for 15 APOGEE chemical elem (Garcia+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/ApJ/835/83 : K2 GAP data release. I. Campaign 1 (Stello+, 2017)J/A+A/618/A109 : Seismic global parameters of 372 KIC (Mosser+, 2018)J/ApJS/239/32 : APOKASC-2 Kepler evolved stars (Pinsonneault+, 2018)J/MNRAS/475/5487 : Stellar properties of KIC stars (Silva Aguirre+, 2018)J/MNRAS/475/3633 : Mass and age of red giant branch stars (Wu+, 2018)J/ApJS/236/42 : Asteroseismology of ~16000 Kepler red giants (Yu+, 2018)J/MNRAS/489/176 : Dynamical heating across Milky Way disc (Mackereth+, 2019)J/ApJ/887/203 : Core rotation period measurements KIC stars (Tayar+, 2019)J/A+A/627/A173 : Abundances for 4 metal-poor stars (Valentini+, 2019)J/MNRAS/491/3251 : Globular clusters in inner Galaxy (Perez-Villegas+, 2020)J/ApJS/251/23 : K2 GAP DR2; campaigns 4, 6 & 7 (Zinn+, 2020)J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)J/ApJ/919/131 : Oscillating red giants from the TESS QLP (Hon+, 2021)J/MNRAS/502/1947 : Giant stars in TESS continuous view zones (Mackereth+, 2021)J/ApJ/912/72 : High-res. spectro for 26 halo KIC stars (Matsuno+, 2021)J/A+A/645/A85 : Age dissection of the Milky Way discs (Miglio+, 2021)J/other/NatAs/5.640 : MW chronological dating early assembly (Montalban+, 2021)J/AJ/161/100 : Ages & alpha-abundances population in K2 (Warfield+, 2021)J/AJ/161/231 : A list of ~330000 stars Kepler missed (Wolniewicz+, 2021)J/AJ/164/135 : 1709 red giants fundamental asteroseismic param (Hon+, 2022)J/ApJ/926/191 : K2 Galactic Archaeology Program DR3, final (Zinn+, 2022)J/A+A/677/A21 : Asteroseismic distances 12500 red-giant stars (Khan+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/50https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/167/50/catalog (The APO-K2 catalog (table 1 to 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/50/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/50/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/50/catalog?GETtext/xml+votable180.050000true129.439315.98180.0055555555555555564/17 22 5/73 75-76 78 84 92 94 101-102 112-113 115-116 119 257 266 1063 1067-1069 1071 1074-1075 1082 1086 1155 1158 1165 1168 1170 1174 1176 1178-1180 1182-1183 1200 1204 1217 1225-1226 4287 4322-4323 4326-4328 4330-4331 4334 4345 4499 4502-4503 4506-4507 4509 4528 4531-4532 4534 4537 4556 4577 4579 4582-4583 4586-4588 4590 4612-4614 4616-4617 4620 4622-4623 4634 4642-4643 4647 4653 4656 4665 4674-4675 4680-4681 4683-4685 4687-4688 4690 4696 4698 5870-5871 5882 6028 6060-6061 6072 6074 6394 6397 6402 6404 6406 6409 6411-6413 6415 6422-6424 6428 6453 6462 6528 6542 6561 6563-6564 6566 6569-6570 6735 6743 6757 6764 6769-6770 6773 6780 6852 6854-6855 6857 6859 6862 6864 6877 6915 6921 7302 7305 7326 7329 7331 7337-7338 10717 10733 10749 11094 11182 11192 11194 12007 12125 6/260-261 263 267-268 270-271 289 291 308 310-311 316-317 319-320 322-323 328-330 334-335 340-342 344 346 349 375 381 383 388-389 391 397 400 402-403 412-413 415 437 439 456 458-459 468 470-473 475 480-482 484 1026 1033 1036 1041 1044 1046 1050-1051 1053 1055-1056 1058-1059 1061 1072-1073 1077 1098 4246-4247 4250-4251 4262-4263 4280 4282-4283 4290 4295 4306 4312-4314 4316 4318-4322 4327 4333 4335-4336 4338 4340-4341 4343 4488 4490-4491 4512 4522-4523 4525-4527 4531 4536-4538 4613 4615 4624 4626-4627 4629 4631 4637-4639 4645 4657-4659 4665 4668-4669 4671 4685 4687-4688 4708 4710-4711 4724 4726-4727 4756-4757 4805 4820 4865-4867 4880 4883 4898-4899 4908 4992 17142-17143 17145 17147 17316-17318 17328-17330 17332-17334 17340 17342 17352 17354 17376 17379 17388-17390 17394 17400 17975 17991 18002-18003 18006-18007 18018-18020 18022-18023 18032 18034-18035 18040-18041 18044-18045 18116 18118 18121 18123 18132-18133 18135 18141-18143 18145 18160-18161 18163-18165 18167 18169 18171-18172 18174-18175 18178-18179 18184-18185 18187 18222-18223 18228 18230 18233 18236 18304-18306 18313-18315 18320 18322 18336-18337 18339-18342 18432-18433 18435-18436 18438-18439 18441 18443-18444 18446-18447 18462 18474-18476 18478-18479 18484 18486 18498 18510-18511 18516-18517 18525 18532-18533 18542 18544 18549 18551 18560-18562 18564-18565 18567 18577-18582 18584-18586 18592 18599 18605 18608-18610 18616-18617 18620-18621 18630-18633 18635-18636 18638 18642-18643 18648-18649 18652 18657-18659 18664-18665 18668-18669 18689-18692 18694-18695 18705 18707 18709-18710 18712-18713 18715-18716 18718-18719 18728-18729 18744 18746-18747 18766 18790 18796-18797 18799 18821 18823 18832-18833 18835-18837 18880-18882 18884-18885 19537 19540-19541 19713 23470-23471 23509 23511 23518-23519 23522-23523 23526 23532-23534 23537-23538 23541-23542 23546-23548 23550 24105 24107-24108 24110 24120-24121 24193 24198-24200 24202-24206 24216 24222-24225 24227 24229-24230 24232-24233 24235-24236 24238 24248-24249 24251 24253-24255 24266 24927 25425-25428 25430 25433 25436 25533 25543 25549 25551 25562-25563 25570 25580 25582 25585-25587 25592-25593 25595 25597 25603 25605 25607 25612 25614-25615 25622 25628 25630-25633 25641-25643 25656-25657 25659 25667 25670-25673 25675-25678 25681 25683-25684 25686-25687 25701 25703-25706 25709 25720 25722-25723 25726 25728-25729 25732-25734 25748-25749 25757-25759 25780-25781 25802 25809 25811 25824 25843 25846 25852-25854 26017 26024 26118 26121 26124 26162-26163 26172 26174-26175 26177-26179 26193 26196 26241 26243 26260 26262-26263 26268 26270 26273-26275 26284 26288-26289 26905 26907 26910-26911 26928-26929 26931-26932 26945 26958 26961 26963 26969 26971 26978 26980-26981 26984-26986 26990-26991 26996-26997 27001-27003 27006-27007 27025 27034 27045 27047 27049 27051-27052 27054-27055 27061 27066 27073 27075 27084 27087 27089 27091 27097-27099 27101 27104-27106 27125 27223 27392-27394 27396-27397 27412 27414 27426-27427 27432-27433 27440 27442-27443 27445-27447 27452-27453 27460 27462 27464 27466-27467 27469 27471 27480 27482-27483 27486 27488-27489 27491-27492 27494-27495 27498-27501 27504 27513-27517 27525 27536-27537 27542-27543 27548-27549 27584-27586 27590-27591 27596-27597 27600-27602 27608 27649 27657-27659 27680-27681 27683 27693-27695 27698 27704 27706 27784 27786-27787 27808 27810 28192 28826-28827 28835 28838 28843 28848 28850 28896-28897 28941 28943 28952 28954 28959 28965 28981 28983 28996 29005-29006 29024 29026 29187-29188 29190 29195 29207 29212-29214 29224-29226 29228 29231 29233 29242 29245 29248 29250-29251 29256 29262 29281 29285 29287 29292 29295 29321 29328-29329 29345 29360 29379 30721 42846-42847 42862 42865 42877 42903 42907 42909 42929 42941 42943 42946 42948 42952-42954 42978-42979 42984-42986 42989 42994 43000 43002 44304-44305 44307-44308 44310-44311 44317 44319 44354 44357-44358 44360-44362 44365-44368 44388 44391 44717 44719 44722-44723 44732-44734 44774 44780 44782 48022-48023 48046 48056 48059 48072 48478 48510-48511 48596-48597 48599 48605 486077.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/167/50?format=asciiOpticaldefaultJ/AJ/167/50/catalogThe APO-K2 catalog (table 1 to 4)EPICEPIC identifiermeta.id;meta.mainlonge_fdeltanu[0/0.09]? Uncertainty in fdeltanuuHzstat.errorfloatnullablef_fdeltanu[0/2] Flag on fdeltanu (4)meta.codeintSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAPOGEEAPOGEE identifiermeta.id.crosscharGaiaGaia DR3 identifiermeta.id.crossCampK2 campaign number(s)obs.fieldcharRAJ2000[8/360] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-31/28] Declination (J2000)degpos.eq.dec;meta.mainGLAT[-67/66] Galactic latitudedegpos.galactic.latfloatGLON[0/360] Galactic longitudedegpos.galactic.lonEvolDerived evolutionary state (1)time.agecharTeff[3726/6232] APOGEE calibrated effective temperatureKphys.temperature.effectiveinte_Teff[4/706] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogg[0.9/4.62] APOGEE calibrated log surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.01/2] Uncertainty in logglog(cm.s**-2)stat.errorfloat[M/H][-2.43/0.53]? APOGEE log metal abundance relative to Hydrogenlog(Sun)phys.abund.Z;arith.ratiofloatnullablee_[M/H][0.005/0.4]? Uncertainty in [M/H]log(Sun)stat.error;phys.abundfloatnullable[Fe/H][-2.45/0.51] APOGEE log Iron abundance relative to Hydrogenlog(Sun)phys.abund.Fe;arith.ratiofloate_[Fe/H][0.006/0.2] Uncertainty in [Fe/H]log(Sun)stat.error;phys.abund.Fefloat[a/M][-0.49/0.78]? APOGEE log {alpha}-element/Metal abundance ratiolog(Sun)phys.abund.Zfloatnullablee_[a/M][0.003/0.6]? Uncertainty in [a/M]log(Sun)stat.errorfloatnullableaFlag[-1/1] The {alpha} flag; see section 3.2meta.codeintVmag[7.02/17.5] Apparent V band Vega magnitude (2)magphot.mag;em.opt.Vfloate_Vmag[0.6/6] Uncertainty in Vmag (2)magstat.error;phot.magfloatJmag[5.14/14.4] EPIC Apparent J band magnitudemagphot.mag;em.IR.Jfloate_Jmag[0.01/0.07] Uncertainty in Jmagmagstat.error;phot.magfloatKsmag[4.48/13.8] EPIC Apparent Ks band magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.01/0.08] Uncertainty in Ksmagmagstat.error;phot.magfloatJ-Ks[0.46/1.43] EPIC (J-K_s_) colormagphot.color;em.IR.J;em.IR.Kfloate_J-Ks[0.02/0.09] Uncertainty in J-Ksmagstat.error;phot.color;em.IR.Jfloatnumax[3.65/258] Frequency of maximum power (3)uHzem.freq;src.varfloate_numax[0.001/4] Uncertainty in numaxuHzstat.errorfloatdeltanu[0.96/18.1]? Large frequency separationuHzem.freqfloatnullablee_deltanu[0/0.4]? Uncertainty in deltanuuHzstat.errorfloatnullablefdeltanu[0.85/1.07]? The {delta}{nu} correction factoruHzinstr.paramfloatnullablekappaM[0.44/5.54]? Asteroseismic mass coefficientphys.massfloatnullablee_kappaM[0.003/1.96]? Uncertainty in kappaMstat.errorfloatnullableMass[0.28/4.49]? Stellar masssolMassphys.massfloatnullablee_Mass[0.005/1.99]? Uncertainty in MasssolMassstat.error;phys.massfloatnullablekappaR[4.1/43.7]? Asteroseismic radius coefficientphys.size.radius;arith.ratiofloatnullablee_kappaR[0.005/10.9]? Uncertainty in kappaRstat.errorfloatnullableRad*[3.75/39.9]? Stellar radiussolRadphys.size.radiusfloatnullablee_Rad*[0.006/10]? Uncertainty in RadiussolRadstat.errorfloatnullableplx[-0.3/18]? Gaia DR3 parallax (5)maspos.parallax.trigfloatnullablee_plx[0.01/0.7]? Uncertainty in plxmasstat.error;pos.parallaxfloatnullablee? Galactic eccentricitysrc.orbital.eccentricitydoublenullablee_e? Uncertainty in estat.errordoublenullableZmax? Maximum excursion from the Galactic planekpcstat.errordoublenullablee_Zmax? Uncertainty in Zmaxkpcstat.errordoublenullableAMom? Orbital angular momentumphys.angMomentumdoublenullablee_AMom? Uncertainty in AMomstat.errordoublenullableETotTotal orbital energyphys.energydoublee_ETot? Uncertainty in ETotstat.errordoublenullableUThe U velocitykm/sphys.veloc;pos.cartesian.xfloate_U? Uncertainty in Ukm/sstat.error;pos.cartesian.xfloatnullableVThe V velocitykm/sphys.veloc;pos.cartesian.yfloate_V? Uncertainty in Vkm/sstat.error;pos.cartesian.yfloatnullableWThe W velocitykm/sphys.veloc;pos.cartesian.zfloate_W? Uncertainty in Wkm/sstat.error;pos.cartesian.zfloatnullableDR3[0/1] Gaia DR3 binary flag (6)meta.codeint