J/ApJ/873/66ivo://CDS.VizieR/J/ApJ/873/66doi:10.26093/cds/vizier.18730066CDSRoman-Lopes A.Roman-Zuniga C.G.Tapia M.Hernandez J.,Ramirez-Preciado V.Stringfellow G.S.Ybarra J.E.Kim J.S.Minniti D.,Covey K.R.Kounkel M.Suarez G.Borissova J.Garcia-Hernandez D.A.,Zamora O.Trujillo J.D.2021-01-11T08:25:02Z2020-10-15T13:04:05ZCDS support team

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

cds-question@unistra.frob-starsinfrared-astronomyspectroscopystellar-spectral-typesline-intensitiesinfrared-photometryIn this work, we have applied a semi-empirical spectral classification method for OB-stars using the APOGEE spectrograph to a sample of candidates in the W3-W4-W5 (W345) complexes. These massive star-forming regions span over 200pc across the Perseus arm and have a notorious population of massive stars, from which a large fraction are members of various embedded and young open clusters. From 288 APOGEE spectra showing H-band spectral features typical of O- and B-type sources, 46 probably correspond to previously unknown O-type stars. Therefore, we confirm that Br11-Br13 together with HeII {lambda}16923 (7-12) and HeII {lambda}15723 (7-13) lines contained in the APOGEE spectral bands are useful in providing spectral classification down to one spectral sub-class for massive stars in regions as distant as d~2kpc. The large number of newly found O-type stars as well as the numerous intermediate-mass population confirm that W345 is a very efficient massive star factory, with an integral stellar population probably amounting several thousand solar masses.2019ApJ...873...66Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/873/66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/76 : Luminous Stars in the Northern Milky Way (LS) (Hardorp+ 1959-1965)III/230 : Magnitudes & spectral types in 5 galactic fields (Voroshilov+, 1985)III/195 : Atlas of Optical Spectral Classification OB Stars (Walborn+ 1990)III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)III/284 : APOGEE-2 data from DR16 (Majewski+, 2017)J/ApJS/2/389 : Observations of O and B stars (Hiltner, 1956)J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)J/ApJ/541/841 : UBV photometry and ages of Trapezium systems (Abt+, 2000)J/AJ/129/393 : UBV photometry in W3 (Oey+, 2005)J/ApJ/688/1142 : Star formation in W5: Spitzer observations (Koenig+, 2008)J/ApJ/743/39 : Spitzer obs. of W3 molecular cloud (Rivera-Ingraham+, 2011)J/A+A/554/A3 : Vilnius photometry of IC1805 stars (Straizys+, 2013)J/MNRAS/439/3719 : Embedded clusters infrared photometry (Chavarria+, 2014)J/A+A/564/A40 : VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)J/ApJ/807/27 : IN-SYNC. III. RVs of IC348 stars (Cottaar+, 2015)J/ApJ/799/136 : IN-SYNC. II. Cand. young stars in NGC 1333 (Foster+, 2015)J/ApJ/813/42 : O and B type stars in W3: first results (Kiminki+, 2015)J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)J/ApJ/822/49 : Cand. YSOs in AFGL 333 with NEWFIRM & Spitzer (Jose+, 2016)J/ApJS/224/4 : GOSSS III. Additional O-type systems (Maiz Apellaniz+, 2016)J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)J/MNRAS/468/2684 : IC1805 YSOs (Panwar+, 2017)J/ApJS/230/3 : Optical & Spitzer photometry in IC 1805 (Sung+, 2017)J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)J/ApJ/855/68 : SDSS-IV/APOGEE Survey massive stars. I. (Roman-Lopes+, 2018)J/A+A/638/A76 : StarHorse data for 5 surveys (Queiroz+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/873/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/873/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/873/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/873/66https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/873/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/873/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/873/66/obstars (SDSS-IV/APOGEE-2 survey OB stars in W3-W4-W5 (W345) (Table 2) and their line parameters (Table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/873/66/obstars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/873/66/obstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/873/66/obstars?GETtext/xml+votable180.050000true37.9878861.61223194440.0055555555555555566/3263 3290 3301 3302 3303 3305 3306 3307 3308 3310 3312 3313 3320 3605 3607 3648 3649 36521.1166583743361574e-19 1.2918781580533825e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/873/66?format=asciiInfrareddefaultJ/ApJ/873/66/obstarsSDSS-IV/APOGEE-2 survey OB stars in W3-W4-W5 (W345) (Table 2) and their line parameters (Table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/60] Running sequence numbermeta.idintAPOGEE2APOGEE-2 position based identifiermeta.id;meta.maincharONameLiterature identifiermeta.idcharHmag[7.16/12.32] 2MASS H magnitudemagphot.mag;em.IR.HfloatSpTlSpectral type from literaturesrc.spTypecharClasslLuminosity class from literaturesrc.class.luminositycharQualAssociated qualifiersrc.spTypecharRef? References for SpTl and Classl (1)meta.refintnullableEWBr11[0.4/2.1]? Equivalent width, Br11 hydrogen recombination0.1nmspect.line.eqWidthfloatnullableFWHMBr11[13.3/45.8]? Full width half maximum, Br11 hydrogen recombination0.1nmspect.line.widthfloatnullableEWBr13[0.2/1.6]? Equivalent width, Br13 hydrogen recombination0.1nmspect.line.eqWidthfloatnullableFWHMBr13[16.3/49.9]? Full width half maximum, Br13 hydrogen recombination0.1nmspect.line.widthfloatnullableEWHe16[0.09/0.8]? Equivalent width, HeII 16923{AA} (7-12)0.1nmspect.line.eqWidthfloatnullableFWHMHe16[8/59.8]? Full width half maximum, HeII 16923{AA} (7-12)0.1nmspect.line.widthfloatnullableEWHe15[0.1/0.6]? Equivalent width, HeII 15723{AA} (7-13)0.1nmspect.line.eqWidthfloatnullableFWHMHe15[12.5/30.4]? Full width half maximum, HeII 15723{AA} (7-13)0.1nmspect.line.widthfloatnullableSpTSpectral Type, this worksrc.spTypecharClassLuminosity Class, this worksrc.class.luminositychar2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 1"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from APOGEE-2 DR16 catalog (III/284) (right ascension part)degpos.eq.ra;meta.main_DEPositions from APOGEE-2 DR16 catalog (III/284) (declination part)degpos.eq.dec;meta.main