J/ApJ/894/5ivo://CDS.VizieR/J/ApJ/894/5doi:10.26093/cds/vizier.18940005CDSRamirez-Preciado V.G.Roman-Lopes A.Roman-Zuniga C.G.Hernandez J.,Garcia-Hernandez D.A.Stassun K.Stringfellow G.S.Kim J.S.2022-01-19T12:59:33Z2021-10-18T10:08:05ZCDS support team

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

cds-question@unistra.frb-starsinfrared-astronomyspectroscopyvisible-astronomyline-intensitiesstellar-spectral-typesWe present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared (NIR) spectra (1.5-1.7{mu}m) from the Sloan Digital Sky Survey Apache Point Observatory Galaxy Evolution Experiment (APOGEE2)-N data release 14 (DR14) database. The main motivation for working with B-type stars is their importance in the evolution of young stellar clusters; however, we also take advantage of having a numerous sample (316 stars) of B-type star candidates in APOGEE2-N, for which we also have optical (3600-9100{AA}) counterparts from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey. By first obtaining an accurate spectral classification of the sources using the LAMOST DR3 spectra and the canonical spectral classification scheme, we found a linear relation between optical spectral types and the equivalent widths of the hydrogen lines of the Brackett series in the APOGEE2-N NIR spectra. This relation extends smoothly from a similar relation for O and early B stars found by Roman-Lopes+ (2018, J/ApJ/855/68). This way, we obtain a catalog of B-type sources with features in both the optical and NIR and a classification scheme refined down to one spectral subclass.2020ApJ...894....5Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/894/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)V/153 : LAMOST DR4 catalogs (Luo+, 2018)III/284 : APOGEE-2 data from DR16 (Johnsson+, 2020)J/ApJS/107/281 : Atlas of hot, luminous stars at 2 microns (Hanson+ 1996)J/ApJS/161/154 : Near-IR spectral atlas of OB stars (Hanson+, 2005)J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)J/AN/331/349 : O, B-type & red supergiant masses & lum. (Hohle+, 2010)J/AJ/151/144 : ASPCAP weights for APOGEE chemical elements (Garcia+, 2016)J/ApJ/855/68 : Massive stars in SDSS-IV/APOGEE SURVEY. I. (Roman-Lopes+, 2018)J/ApJS/241/32 : OB stars from the LAMOST DR5 spectra (Liu+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/894/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/894/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/894/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/894/5https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/894/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/894/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/894/5/table1 (NIR parameters for the control in APOGEE-2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/894/5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/894/5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/894/5/table1?GETtext/xml+votable180.050000true87.514206111134.41765194440.0055555555555555565/333 3691 3733 5608 5965 6003 6/1282-1283 1292 1298 1304 1307 1329 1331 1353 1359 1369 1380 1387 1400 1404 1417 1428-1429 1432-1433 1436 1461 1489 1857 1873 1883 4109 4111 4780 4793 5715 5807 5810 6158 6170 6210 6223 6241 6271 6291 6296 6299 6302 6306 6358 6363-6364 6366-6367 6387 6393 6540 6552 6678 6689 6692 6720 6723 6728 6765 6877 10669 14187 14518 14573 14575 14579 14582-14584 14589 14591 14705 14730-14731 14733-14735 14738 14744 14750-14752 14754-14756 14758-14759 14762 14772-14773 14775 14777 14781-14782 14792 14794-14795 14818 14824-14825 14827 14831 14918-14919 14921 14923 14928-14930 14941 14947 14963 14966 14969 15104 15107-15109 15113 15115-15116 15118 15121-15123 15126-15127 15132-15133 15137 15146 15160 15169-15170 15172 21359 21435 21438 21456 22095 22217 22230 22242-22243 22245 22249-22251 22255 22258 22263-22264 22316 22319 22410 22416 22502 22504 22507-22508 23638 23736 23759 23771 23794 23800 23803 23806 23808 23811 23816 23822-23823 23844 23846 23856 23858 23869 23871 23904 23912 23954-23955 23986-23988 23990 23999-24001 24010 24018 24023 24025 24028 24036 24052 24054-24055 24060-24061 24116 24145 24182 24191 24246 24332 24338-24339 24343-24346 24362 24375 24446 24466 24471 24494 24545https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/894/5?format=asciiOpticalInfrareddefaultJ/ApJ/894/5/table1NIR parameters for the control in APOGEE-2SpTSpectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDAPOGEE identifier (2MHHMMSSss+DDMMSSs)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.raDEJ2000Degree of Declination (J2000)pos.eq.decBr11[2.75/10.95] Equivalent width, HI 11-4 (Brackett 1681.1111nm)0.1nmspect.line.eqWidthfloate_Br11[0/2.21] Uncertainty in Br110.1nmstat.errordoubleFWHMBr11[15.65/65.82] Full width at half maximum, HI 11-40.1nmspect.line.widthfloate_FWHMBr11[0/25] Uncertainty in FWHMBr110.1nmstat.errordoubleBr13[1.83/11.41] Equivalent width, HI 13-4 (Brackett 1611.3714nm)0.1nmspect.line.eqWidthfloate_Br13[0.08/1.3] Uncertainty in Br130.1nmstat.errordoubleFWHMBr13[16.5/86.1] Full width at half maximum, HI 13-40.1nmspect.line.widthfloate_FWHMBr13[0/32] Uncertainty in FWHMBr130.1nmstat.errordouble2MDisplay the 2MASS data (II/246) within 0.5"meta.ref.urlcharDR4Display the LAMOST DR4 data (V/153) within 0.5"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from APOGEE-2 DR16 cat. (III/284) (right ascension part)degpos.eq.ra;meta.main_DEPositions from APOGEE-2 DR16 cat. (III/284) (declination part)degpos.eq.dec;meta.main