J/ApJ/937/110ivo://CDS.VizieR/J/ApJ/937/110doi:10.26093/cds/vizier.19370110CDSLiu Z.Cui W.Liu C.Alexeeva S.Shi J.Zhao G.2024-11-06T20:27:35Z2024-09-09T07:41:23ZCDS support team

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

cds-question@unistra.frchemical-abundancesb-starsvisible-astronomyspectroscopystellar-spectral-typesgiant-starseffective-temperatureWe present detailed criteria for the classification of subtypes of B-type supergiants and apply them to 97 supergiants chosen manually from the LAMOST DR5 data set. We obtained the physical parameters (effective temperature, surface gravity, projected rotational velocity) and chemical abundances of C and Si for 103 B-type stars, including 62 supergiants. Non-LTE TLUSTY atmospheric models are employed in our analysis. Projected rotational velocities of B-type stars are found to be systematically smaller than those of the old clusters in the Milky Way. The spectral types and luminosity classes of our manually classified B-type stars are consistent with their effective temperatures and surface gravities derived from the model spectral matching method, respectively. The obtained C and Si abundances for most of our B-type stars are subsolar. Our results indicate that a silicon abundance gradient is -0.0419+/-0.0226dex/kpc in the region of 7.1kpc<=Rg<=14.1kpc, which is in agreement with previous studies.2022ApJ...937..110Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/937/110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)V/164 : LAMOST DR5 catalogs (Luo+, 2019)V/156 : LAMOST DR7 catalogs (Luo+, 2019)J/A+A/434/1125 : B-type Supergiants in the SMC (Dufton+, 2005)J/A+A/436/687 : SMC NGC 346-11 and AV 304 spectra (Hunter+, 2005)J/AJ/129/809 : B-star rot. velocities in h and {chi} Persei (Strom+, 2005)J/A+A/457/265 : The VLT-FLAMES Survey of Massive Stars (Dufton+, 2006)J/A+A/466/277 : VLT-FLAMES survey of massive stars (Hunter+, 2007)J/A+A/471/625 : VLT-FLAMES survey of massive stars (Trundle+, 2007)J/AJ/133/1092 : vsini of B0-B3 stars in 7 young clusters (Wolff+, 2007)J/A+A/539/A143 : Nearby B-stars stellar param. and abundances (Nieva+, 2012)J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)J/A+A/580/A17 : {alpha}-element abundances of Cepheid stars (Genovali+, 2015)J/A+A/603/A91 : VLTS. B-type main-sequence binary systems (Garland+, 2017)J/A+A/613/A65 : Spectroscopic parameters of O-type stars (Holgado+, 2018)J/AJ/156/171 : Cepheid abundances: spatial gradients (Luck, 2018)J/AJ/158/73 : OB stars & their bow shock nebulae (Kobulnicky+, 2019)J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019)J/ApJS/253/22 : Ks absolute magnitudes from LAMOST for OB stars (Xiang+, 2021)http://dr5.lamost.org/v3/ : LAMOST DR5 v3 homepagehttp://dr6.lamost.org/ : LAMOST DR6 v2 online accesshttp://dr7.lamost.org/v2.0/ : LAMOST DR7 v2.0 onlinehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/937/110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/937/110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/937/110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/937/110https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/937/110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/937/110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/937/110/table3 (The stellar parameters and elemental abundances for B-type stars in LAMOST; updated version)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/937/110/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/937/110/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/937/110/table3?GETtext/xml+votable180.050000true13.981443.141840.0055555555555555560/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/937/110?format=asciiOpticaldefaultJ/ApJ/937/110/table3The stellar parameters and elemental abundances for B-type stars in LAMOST; updated versionrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsID[5116047/647602217] LAMOST Observation ID (1)meta.id;obslongLAMOSTLAMOST identifier (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000[13.98/346.14] Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-3.04/58.7] Declination (J2000)degpos.eq.dec;meta.mainS/N[16/974] Signal-to-noise ratio at the g-bandstat.snrfloatSpTSpectral type using our criteriasrc.spTypecharTeff[15/30]? Effective temperaturekKphys.temperature.effectiveintnullablef_TeffFlag on Teff (2)meta.codecharlogg[2.25/4]? Log of surface gravitylog(cm.s**-2)phys.gravityfloatnullablevsini[10/270]? Rotational velocitykm/sphys.veloc.rotatintnullablen_vsiniThe metal line used to obtain vsinimeta.notecharVt[5/20]? Microturbulent velocitykm/sphys.veloc.microTurbintnullablelogeC[6.93/8.3]? C abundancephys.abundfloatnullablee_logeC[0.05/0.5]? logeC uncertaintystat.errorfloatnullablelogeSi[6.54/8.13]? Si abundancephys.abundfloatnullablee_logeSi[0/0.5]? logeSi uncertaintystat.errorfloatnullableRg[3.7/19.3]? Galactocentric distance (3)kpcpos.distance;pos.galactocentricfloatnullablee_Rg[0/3]? Rg uncertaintykpcstat.errorfloatnullableX21Display data from Xiang+ 2021, J/ApJS/253/22 within 1"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.ref.urlchar