J/ApJ/889/117ivo://CDS.VizieR/J/ApJ/889/117doi:10.26093/cds/vizier.18890117CDSLei Z.Zhao J.Nemeth P.Zhao G.2022-07-08T07:06:09Z2021-08-06T13:04:24ZCDS support team

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

cds-question@unistra.frsubdwarf-starschemical-abundancesstellar-spectral-types182 single-lined hot subdwarf stars are identified by using spectra from the sixth and seventh data releases (DR6 and DR7) of the Large Sky Area Multi-Object Fibre Spectroscopic Telescope survey. We classified all the hot subdwarf stars using a canonical classification scheme, and got 89 sdB, 37 sdOB, 26 sdO, 24 He-sdOB, 3 He-sdO, and 3 He-sdB stars, respectively. Among these stars, 108 hot subdwarfs are newly discovered, while 74 stars were reported by previous catalogs. The atmospheric parameters of these stars were obtained by fitting the hydrogen (H) and helium (He) lines with non-local thermodynamic equilibrium model atmospheres. The atmospheric parameters confirm the two He sequences and the two subgroups of He-sdOB stars in our samples, which were found by previous studies in the T_eff_-log(nHe/nH) diagram. Our results demonstrate different origins of field hot subdwarf stars and extreme horizontal branch stars in globular clusters, and provide strict observational limits on the formation and evolution models of the different sub-types of these evolved objects. Based on the results, we evaluated the completeness of the Geier+ (2017, J/A+A/600/A50) catalog. We found the fraction of hot subwarf stars is between 10% and 60%, depending on the brightness of the sample. A more accurate estimation for the hot subdwarf fraction can be obtained when similar results from composite spectra will become available.2020ApJ...889..117Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/889/117CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/137 : Spectroscopically Identified Hot Subdwarf Stars (Kilkenny+ 1988)VI/65 : Evolutionary models of evolved stars (Dorman+ 1993)III/258 : Revised and updated First Byurakan Survey (FBS) (Mickaelian, 2008)I/345 : Gaia DR2 (Gaia Collaboration, 2018)V/164 : LAMOST DR5 catalogs (Luo+, 2019)J/ApJ/419/596 : Pop I UV radiation models (Dorman+, 1993)J/MNRAS/287/867 : Edinburgh-Cape Blue Object Survey. Zone 1. (Kilkenny+ 1997)J/A+A/400/939 : Stellar parameters of 115 HQS sdB stars (Edelmann+, 2003)J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)J/A+A/565/A100 : NGC 288 hot horizontal branch stars abund. (Moehler+, 2014)J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)J/A+A/576/A44 : Hot subdwarf binaries from MUCHFUSS (Kupfer+, 2015)J/ApJ/818/202 : Hot subdwarf stars in LAMOST DR1 (Luo+, 2016)J/MNRAS/455/3413 : New WD and subdwarf stars in SDSS DR12 (Kepler+, 2016)J/A+A/600/A50 : Catalog of hot subdwarf stars (Geier+, 2017)J/A+A/618/A15 : Parameters of EHB stars in {omega} Cen (Latour+, 2018)J/ApJ/868/70 : Hot subdwarf stars from Gaia DR2 and LAMOST DR5 (Lei+, 2018)J/A+A/621/A38 : Gaia catalogue of hot subluminous stars (Geier+, 2019)J/ApJ/881/135 : Hot subdwarf stars from Gaia2 & LAMOST DR5. II. (Lei+, 2019)http://www.lamost.org/ : LAMOST home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/889/117https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/889/117http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/889/117https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/889/117https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/889/117http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/889/117GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/889/117/table1 (Information on the 182 hot subdwarf stars identified in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/889/117/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/889/117/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/889/117/table1?GETtext/xml+votable180.050000true1.890718313.59932440.0055555555555555566/655 907 930 955 1041 1162 1177 1405 1415 1720 1760 2007 2170 2233 2449 2458 2468 2497 2526 2791-2792 2796 2805-2807 2852 2860 2871-2872 2877 2958 2978 2993 3089 3117 3236 3243 4276 4382 4411 4576 4722 4797 4807 4818 4960 5019 5113 6196 6200 6461 6477 6614 6676 6844 6881 7023 7057 7100 7881 8119 8255 8278 8283 8297 8425 8447 8467 8469 8707 8773 8891 9202 9288 9298 9304 9677 9699 10022 10024 10042 10670 11016 11275 12374 12405 12411 12501 12510 12673 12723 13278 13370 13402 13404 13434-13435 13592 13607 13667 13683 13720 13769 13778 13805 13818 13962 14552 14555 14585 14940 15105 19098 19120 19126 19666 20128 20255 20294 20337 20390 20402 20410 20452 21867 21952 22272 22279 22281 22387 22471 22478 23465 23511 23762 23932 23988 24021 24148 24204 24214 25990 26015 26215 26453 26488 26564 27208 27352 28302 28335 28666 30196-30197 30206 30549 31453 31528 31683 31810 31858 31914 31961 31963 31989 32142 32160-32161 32265 32300 32307-32308 32330 32335 32633 32707 32721 327241.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/889/117?format=asciidefaultJ/ApJ/889/117/table1Information on the 182 hot subdwarf stars identified in this studylogHe/H[-3.5/3] Log He/H abundance (1)phys.abundfloatl_logHe/HUpper limit flag on logHe/Hmeta.code.error;phys.abund.YcharSpTSpectral classificationsrc.spTypecharrecnoRecord 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.mainG17[*] *: source also in Geier+ 2017, J/A+A/600/A50meta.codecharObsIDLAMOST observation identifiermeta.id;obs.param;obslongGaiaGaia DR2 source identifiermeta.id;meta.mainTeff[22230/79240] Effective temperature (1)Kphys.temperature.effectiveinte_Teff[10/11150] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[5/6.9] Log surface gravity (1)log(cm.s**-2)phys.gravityfloate_log(g)[0/0.8] Uncertainty in log(g)log(cm.s**-2)stat.errorfloate_logHe/H[0.01/1.1]? Uncertainty in logHe/Hstat.error;phys.abund.YfloatnullableSNRu[10/162] Signal to noise in the u bandstat.snrintGmag[12/18] Apparent Gaia DR2 G band magnitudemagphot.mag;em.optfloatDR4+5Display data from LAMOST DR4 (V/153) and DR5 (V/164) if anymeta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar