J/ApJS/271/21ivo://CDS.VizieR/J/ApJS/271/21doi:10.26093/cds/vizier.22710021CDSLuo Y.Nemeth P.Wang K.Pan Y.2024-11-06T20:31:05Z2024-06-03T12:21:11ZCDS support team

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

cds-question@unistra.frchemical-abundancessubdwarf-starsradial-velocitystellar-radiivisible-astronomyspectroscopyWe conducted an analysis of the abundances of He, C, and N in 210 He-rich hot subdwarfs observed within both the Gaia Data Release 3 (DR3) and LAMOST DR7 data sets. This analysis involved fitting the LAMOST spectra with Tlusty/Synspec non-LTE synthetic spectra. By examining the Galactic spatial positions, velocity vectors, and orbital parameters of these stars, we determined their Galactic population memberships utilizing LAMOST radial velocities and Gaia DR3 parallaxes along with proper motions. Our investigation revealed two positive correlations of C and one positive correlation of N with respect to the He abundance. We found a clear C abundance dichotomy where approximately 82% of the stars show N enrichment above the solar value. Moreover, we observed a bimodal distribution of C abundances, prominently evident in both the Galactic thin and thick disks but absent in the halo population. Furthermore, we found that the scenario of the merger channel of double helium white dwarfs is inadequate to explain the formation of C-deficient He-rich hot subdwarfs.2024ApJS..271...21Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/271/21CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/156 : LAMOST DR7 catalogs (Luo+, 2019)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/A+A/400/877 : White dwarfs 3D kinematics from SPY project (Pauli+, 2003)J/A+A/447/173 : 3D-kinematics of WDs from SPY project. II. (Pauli+, 2006)J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)J/ApJ/868/70 : Hot subdwarf stars from Gaia DR2 and LAMOST DR5 (Lei+, 2018)J/A+A/630/A130 : Co-added spectra of HD127493 and HZ44 (Dorsch+, 2019)J/ApJ/881/135 : Hot subdwarfs from GaiaDR2 & LAMOST DR5. II. (Lei+, 2019)J/ApJ/881/7 : Hot subdwarf stars from LAMOST DR5 & Gaia DR2 (Luo+, 2019)J/A+A/643/A22 : UVES spectra of Feige 46 and LSIV -14 116 (Dorsch+, 2020)J/A+A/635/A193 : Catalogue of hot subdwarf stars DR2 (Geier, 2020)J/ApJ/889/117 : Hot subdwarfs from Gaia DR2 & LAMOST DR6+7. I. (Lei+, 2020)J/ApJ/898/64 : Hot subdwarfs from Gaia with LAMOST sp. II. RVs (Luo+, 2020)J/MNRAS/491/874 : Abundances of hot subdwarfs with Subaru (Naslim+, 2020)J/ApJS/256/28 : Hot subdwarfs with Gaia DR2 and LAMOST DR7 data (Luo+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/271/21https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/271/21http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/271/21https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/271/21https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/271/21http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/271/21GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/271/21/table3 (Atmospheric parameters, Galactic velocities, and orbital parameters for He-rich hot subdwarf stars observed in Gaia DR3 and LAMOST DR7)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/271/21/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/271/21/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/271/21/table3?GETtext/xml+votable180.050000true2.936431146.801890.0055555555555555566/43 168 220 448 730 1004 1260 1279 1356 1405 1688 1724 2094 2170 2228 2292 2358 2468 2593 2600 2792 2847 2860 2958 4123 4216 4285 4320 4374 4382 4630 4711 4739 4753 4781 4938 4976 5057 5199 5639 5654 5866 5884 5908 5917 5944 6204 6267 6446 6536 6547 6560 6562 6684 6741 6754 6772 6844 6854 6889 6975 6988 7861 7881 7903 8325 8391 8441 8518 8570 8572 8707 8791 8806 8891 9186 9202 9254 9288 9349 9373 9510 9959 9969 10022 10322 10376 10471 10670 11016 11145 11802 12023 12451 12505 12510 12565-12566 12577 12673 12721-12722 12734 12775 13266 13429 13505 13582 13720 13805 13873 13883 13972 14026 14573 14585 14772 14888 15105 15124 15128 15310 17789 17864 18337 19004 19120 19241 19244 19329 19361 19415 19710 20054 20156 20165 20294 21803-21804 21836 22339 22400 22428 22448 22456 22480 22734 22889 23421 23470 23510-23511 23658 23747 23813 23925 23965 23998 24024 24032 24133 24138 24148 24162 24194 24214 24377 24383 24400 24404 24437 24531 24553 25950 26215 26223 26413 26416 27000 27049 27284 27321 27839 27841 27913 27999 28440 30172 31255 31381 31413 31438 31444 31528 31550 31856 31914 32160 32308 32385 32502 40948https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/271/21?format=asciiOpticaldefaultJ/ApJS/271/21/table3Atmospheric parameters, Galactic velocities, and orbital parameters for He-rich hot subdwarf stars observed in Gaia DR3 and LAMOST DR7SimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA_ICRSBarycentric Right Ascension (ICRS) at Ep=2000degpos.eq.ra;meta.mainDE_ICRS[-6.2/76] Barycentric Declination (ICRS) at Ep=2000degpos.eq.dec;meta.mainTeff[12690/105590] Stellar effective temperatureKphys.temperature.effectiveinte_Teff[10/10280] Standard error in TeffKstat.error;phys.temperature.effectiveintlogg[3.7/9.8] Log stellar surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0/4.6] Standard error in logglog(cm.s**-2)stat.errorfloatlog(nHe/nH)[-4.4/4] Stellar surface log He abundancelog(Sun)phys.abundfloate_log(nHe/nH)[0/1.1] Standard error in log (nHe/nH)log(Sun)stat.errorfloatlog(nC/nH)[-7/2.3] Stellar surface log C abundancelog(Sun)phys.abundfloate_log(nC/nH)[0/2.2] Standard error in log (nC/nH)log(Sun)stat.errorfloatlog(nN/nH)[-6/1.24] Stellar surface log N abundancelog(Sun)phys.abundfloate_log(nN/nH)[0/14] Standard error in log (nN/nH)log(Sun)stat.errorfloatlog(beta-He)[-3.8/0] Log mass fraction of surface He abundance (1)phys.abundfloate_log(beta-He)[0/1.5] Standard error in log (beta-He)stat.errorfloatlog(beta-C)[-7/-0.78] Log mass fraction of surface C abundance (1)phys.abundfloate_log(beta-C)[0.02/2.2] Standard error in log (beta-C)stat.errorfloatlog(beta-N)[-6/-1.4] Log mass fraction of surface N abundance (1)phys.abundfloate_log(beta-N)[0/14] Standard error in log (beta-N)stat.errorfloatvsini[5/758] Rotational velocitykm/sphys.veloc.rotatinte_vsini[4/250] Standard error in vsinikm/sstat.error;phys.veloc.rotatintpmRA[-87.2/82] Gaia EDR3 proper motion in RAmas/yrpos.pm;pos.eq.rafloate_pmRA[0.02/0.9] Standard error pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-97.5/31] Gaia EDR3 proper motion in DEmas/yrpos.pm;pos.eq.decfloate_pmDE[0.02/0.6] Standard error in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatdist[192/10560] Gaia EDR3 stellar distancepcpos.distanceinte_dist[2/4106] Standard error in distpcstat.errorintRVel[-334/173] Radial velocity from LAMOST DR7 spectrakm/sphys.veloc;pos.heliocentricinte_RVel[1/150] Standard error in RVelkm/sstat.error;spect.dopplerVelocintU[-297/352] Galactic radial velocity positive towards Galactic centerkm/sspect.dopplerVeloc;pos.galacticinte_U[0/72] Standard error in Ukm/sstat.error;pos.cartesian.xintV[-174/309] Galactic rotational velocity along Galactic rotationkm/sphys.veloc.rotat;pos.galacticinte_V[0/121] Standard error in Vkm/sstat.error;pos.cartesian.yintW[-179/198] Galactic velocity towards north Galactic polekm/sphys.veloc;pos.galacticinte_W[0/70] Standard error in Wkm/sstat.error;pos.cartesian.zintRap[5.5/33.07] Apocenter radius (2)kpcphys.size.radiusfloate_Rap[0/25.7] Standard error in Rapkpcstat.errorfloatRperi[0.07/14] Pericenter radius (2)kpcphys.size.radiusfloate_Rperi[0.01/5] Standard error in Rperikpcstat.errorfloatzmax[0.02/1] Maximum vertical height (2)kpcpos.cartesian.z;pos.galacticfloate_zmax[0/0.2] Standard error in zmaxkpcstat.errorfloatecc[0.09/28.1] Eccentricity (2)src.orbital.eccentricityfloate_ecc[0/21.8] Standard error in eccstat.errorfloatJz[-1770/3141] Z-component of angular momentum (2)kpc.km**-1.s**-1phys.angMomentuminte_Jz[1/1324] Standard error in Jzkpc.km**-1.s**-1stat.errorintPops[0/2] Population classification (3)meta.codeintp(TH)[0/1] Probability in thin disk%statfloatp(TK)[0/1] Probability in thick disk%statfloatp(H)[0/1] Probability in halo%statfloatLAMOSTLAMOST target (JHHMMSS.ss+DDMMSS.s)meta.id;meta.mainchar