J/ApJ/868/70ivo://CDS.VizieR/J/ApJ/868/70doi:10.26093/cds/vizier.18680070CDSLei Z.Zhao J.Nemeth P.Zhao G.2020-03-26T14:17:07Z2019-11-20T14:45:20ZCDS support team

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

cds-question@unistra.frsubdwarf-starsastronomical-object-identificationchemical-abundancesradial-velocityvisible-astronomynarrow-band-photometrystellar-spectral-typesWe selected 4593 hot subdwarf candidates from the Gaia DR2 Hertzsprung-Russell (HR) diagram. By combining the sample with Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) DR5, we identified 294 hot subdwarf stars, including 169 sdB, 63 sdOB, 31 He-sdOB, 22 sdO, 7 He-sdO, and 2 He-sdB stars. The atmospheric parameters (e.g., Teff, logg, log(nHe/nH)) are obtained by fitting the hydrogen (H) and helium (He) line profiles with synthetic spectra. Two distinct He sequences of hot subdwarf stars are clearly presented in the Teff-logg diagram. We found that the He-rich sequence consists of the bulk of sdB and sdOB stars, as well as all of the He-sdB, He-sdO, and He-sdOB stars in our samples, while all the stars in the He-weak sequence belong to the sdO spectral type, combined with a few sdB and sdOB stars. We demonstrated that the combination of Gaia DR2 and LAMOST DR5 allows one to uncover a huge number of new hot subdwarf stars in our Galaxy.2018ApJ...868...70Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/868/70CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/207 : Palomar-Green catalog UV-excess stellar objects (Green+ 1986)VI/65 : Evolutionary models of evolved stars (Dorman+ 1993)I/345 : Gaia DR2 (Gaia Collaboration, 2018)V/153 : LAMOST DR4 catalogs (Luo+, 2018)J/A+A/400/939 : Stellar parameters of 115 HQS sdB stars (Edelmann+, 2003)J/MNRAS/380/1098 : UV-upturn of elliptical galaxies model (Han+, 2007)J/A+A/530/A28 : Priority targets for the MUCHFUSS project (Geier+, 2011)J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)J/ApJ/764/25 : FUSE spectra analysis of hot subdwarf stars (Jenkins, 2013)J/ApJ/818/202 : Hot subdwarf stars in LAMOST DR1 (Luo+, 2016)J/other/RAA/16.G7 : Nearby M subdwarfs from LAMOST DR2 (Bai+, 2016)J/A+A/600/A50 : Catalog of hot subdwarf stars (Geier+, 2017)J/A+A/616/A10 : Open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2018)J/A+A/621/A38 : Gaia catalogue of hot subluminous stars (Geier+, 2019)J/ApJS/240/31 : M-subdwarf research. I. LAMOST DR4 spectra (Zhang+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/868/70https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/868/70http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/868/70https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/868/70https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/868/70http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/868/70GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/868/70/table1 (The information of 294 hot subdwarf stars identified in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/868/70/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/868/70/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/868/70/table1?GETtext/xml+votable180.050000true0.076722.300790.0055555555555555566/43 142 331 457 718 765 888 1004 1202 1252 1260 1291 1310 1351 1356 1362 1429 1468 1559 1563 1564 1570 1572 1602 1668 1684 1686 1712 1724 1792 1809 2162 2221 2292 2346 2349 2424 2540 2561 2584 2591 2593 2616 2625 2626 2843 3584 3588 4105 4164 4233 4285 4293 4295 4297 4319 4345 4346 4630 4653 4658 4697 4704 4709 4790 4931 4938 4943 4955 5047 5550 5655 5710 6173 6174 6234 6246 6247 6254 6295 6385 6536 6659 6661 6696 6754 6827 6848 7052 7085 8284 8500 8518 8696 8770 8791 8812 8813 9061 9237 9273 9349 9372 9470 9501 9585 9664 9690 9762 9763 9775 9790 9812 9909 9959 9981 10048 10083 10132 10144 10146 10378 10379 10459 10504 10602 10903 11029 11144 11145 11157 11194 11264 12289 12498 12505 12697 12717 12721 12775 12838 13026 13145 13163 13206 13291 13319 13354 13426 13437 13601 13833 13857 13873 13883 14049 14578 14751 14772 14775 14779 14825 14868 14915 14921 14943 14960 15124 15128 15132 15172 15310 17865 18031 18132 18372 18418 18863 18906 19270 19309 19361 19590 19649 19710 19898 19904 19905 19962 20002 20165 20219 20236 20279 21748 21803 21836 21876 22248 22304 22334 22339 22422 22438 22441 22452 22463 22503 22743 23157 23356 23444 23468 23470 23510 23648 23658 23661 23691 23763 23781 23807 23823 23845 23893 23925 23929 23972 23973 23988 23992 24005 24025 24063 24074 24075 24089 24124 24136 24150 24165 24242 24330 24340 24383 24400 24415 24437 24475 24522 24531 24533 24553 24560 25845 25915 25921 25972 26319 26533 26606 26609 27000 27045 27126 27175 27187 27317 27324 27487 27956 28134 28370 28587 31062 31142 31444 31470 31518 31549 31613 31622 31715 31884 31912 31923 32372 32380 32456 32476 32528 32550 368511.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/868/70?format=asciiOpticaldefaultJ/ApJ/868/70/table1The information of 294 hot subdwarf stars identified in this studyGaiaGaia DR2 (I/345) identifiermeta.id;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000LAMOST Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000LAMOST Declination (J2000)degpos.eq.dec;meta.mainLAMOST[2604051/584512022] LAMOST DR5 identifiermeta.id.crosslongFlag1[*] *: also in Geier+ 2017, J/A+A/600/A50meta.code.errorcharFlag2d: also in Nemeth+ 2012, J/MNRAS/427/2180meta.code.errorcharFlag3D: also in Luo+ 2016, J/ApJ/818/202meta.code.errorcharTeff[21290/84550] Effective temperature (1)Kphys.temperature.effectiveinte_Teff[10/14680] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[5/6.8] log surface gravity (1)log(cm.s**2)phys.gravityfloate_log(g)[0/0.9] Uncertainty in log(g)log(cm.s**2)stat.errorfloatl_log(He/H)Limit flag on log(He/H)meta.code.errorcharlog(He/H)[-3.5/4.1] log He/H number abundance (1)meta.idfloate_log(He/H)[0.01/1.1]? Uncertainty in log(He/H)stat.errorfloatnullableRVel[-268.2/407.3] Radial velocity (1)km/sphys.veloc;pos.heliocentricfloatGmag[10.1/257.1] Apparent Gaia G band magnitudemagphot.mag;em.opt.VfloatSNRU[10.4/16.5] Signal-to-Noise for u band imagestat.snrfloatSClassSpectral classification type (2)src.spTypecharDR4Display the LAMOST DR4 data (V/153) within 0.05"meta.ref.urlintnullablesdCatDisplay data from Geier+ 2017, J/A+A/600/A50 ; Nemeth+ 2012, J/MNRAS/427/2180 and Luo+ 2016, J/ApJ/818/202 within 3"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar