J/ApJ/838/61ivo://CDS.VizieR/J/ApJ/838/61doi:10.26093/cds/vizier.18380061CDSPovich M.S.Busk H.A.Feigelson E.D.Townsley L.K.Kuhn M.A.2021-01-25T08:15:17Z2017-12-05T14:40:29ZCDS support team

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

cds-question@unistra.frinfrared-photometrystellar-spectral-typesh-ii-regionsopen-star-clustersob-starsextinctionx-ray-sourcesMassive O-type and early B-type (OB) stars in the nearby Galaxy remain incompletely cataloged due to high extinction, bright visible and infrared nebular emission in H II regions, and high field star contamination. These difficulties are alleviated by restricting the search to stars with X-ray emission. Using the X-ray point sources from the Massive Young Star-forming Complex Study in Infrared and X-Rays (MYStIX) survey of OB-dominated regions, we identify 98 MYStIX candidate OB (MOBc) stars by fitting their 1-8{mu}m spectral energy distributions (SEDs) with reddened stellar atmosphere models. We identify 27 additional MOBc stars based on JHK_S_ photometry of X-ray stars lacking SED fitting. These candidate OB stars indicate that the current census of stars earlier than B1, taken across the 18 MYStIX regions studied, is less than 50% complete. We also fit the SEDs of 239 previously published OB stars to measure interstellar extinction and bolometric luminosities, revealing six candidate massive binary systems and five candidate O-type (super)giants. As expected, candidate OB stars have systematically higher extinction than previously published OB stars. Notable results for individual regions include identification of the OB population of a recently discovered massive cluster in NGC 6357, an older OB association in the M17 complex, and new massive luminous O stars near the Trifid Nebula. In several relatively poorly studied regions (RCW 38, NGC 6334, NGC 6357, Trifid, and NGC 3576), the OB populations may increase by factors of 2.2017ApJ...838...61Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/838/61CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2014)II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)V/116 : Galactic O star catalog (Maiz-apellaniz+, 2004)V/125 : Photometry and Spectroscopy for Luminous Stars (Reed 2005)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)III/274 : Galactic O-Star Spectroscopic Survey (Sota+, 2014)J/ApJS/69/99 : NGC 6334 centers of star formation JHK photom. (Straw+ 1989)J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)J/A+A/395/499 : XMM observations in M8 and NGC6530 (Rauw+, 2002)J/ApJ/598/375 : Chandra X-ray observations of NGC 2024 (Skinner+, 2003)J/AJ/129/393 : UBV photometry in W3 (Oey+, 2005)J/ApJ/643/965 : Spitzer photometry of the Trifid nebula (M20) (Rho+, 2006)J/AJ/132/1100 : X-ray and IR sources in RCW 38 (Wolk+, 2006)J/ApJS/169/353 : Chandra sources in M17 (Broos+, 2007)J/ApJ/670/428 : Bubbles in the galactic disk. II. (Churchwell+, 2007)J/AJ/134/999 : X-ray observations of NGC 2264 (Dahm+, 2007)J/ApJS/168/100 : X-ray study of star-forming region NGC 6357 (Wang+, 2007)J/AJ/135/693 : X-ray and IR sources in RCW 108 (Wolk+, 2008)J/AJ/138/227 : Stellar clusters in NGC 6334 complex (Feigelson+, 2009)J/ApJ/696/1278 : The extended star-forming environment of M17 (Povich+, 2009)J/ApJ/708/1760 : Flux estimations of faint X-ray sources (Getman+, 2010)J/ApJ/725/2485 : X-rays from the star-forming complex W40 (Kuhn+, 2010)J/ApJS/194/4 : Classification of CCCP X-ray sources (Broos+, 2011)J/ApJS/194/5 : Carina OB stars in the CCCP catalog (Gagne+, 2011)J/ApJS/194/6 : Candidate X-ray emitting OB stars in Carina (Povich+, 2011)J/ApJ/733/50 : Mid-IR photom. monitoring of the ONC (Morales-Calderon+, 2011)J/A+A/527/A77 : NGC 1893 optical and NIR photometry (Prisinzano+, 2011)J/ApJ/733/113 : IRAC observations of IC 1795 (Roccatagliata+, 2011)J/ApJ/743/39 : Spitzer obs. of W3 molecular cloud (Rivera-Ingraham+, 2011)J/ApJ/743/166 : X-ray and infra-red study of RCW 38 (Winston+, 2011)J/A+A/538/A142 : OB stars in NGC 6334 and NGC 6357 (Russeil+, 2012)J/A+A/550/A107 : RV catalogue of O stars in 30 Doradus (Sana+, 2013)J/A+A/555/A83 : X-ray properties of HM1 and IC2944/2948 (Naze+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/ApJS/209/27 : MYStIX: the Chandra X-ray sources (Kuhn+, 2013)J/ApJS/209/28 : MYStIX Wide-Field NIR data: crowded fields (King+, 2013)J/ApJS/209/29 : MYStIX: Mid-IR observations and catalogs (Kuhn+, 2013)J/ApJS/209/30 : MYStIX project: Bayesian matching (Naylor+, 2013)J/ApJS/209/31 : The MYStIX IR-Excess Source catalog (MIRES) (Povich+, 2013)J/ApJS/209/32 : Probable young stars in the MYStIX project (Broos+, 2013)J/ApJS/213/1 : The MSFRs Omnibus X-ray Catalog (MOXC) (Townsley+, 2014)J/ApJ/787/107 : Spatial structure of young stellar clusters. I. (Kuhn+, 2014)J/ApJ/813/42 : O and B type stars in W3: first results (Kiminki+, 2015)J/ApJS/227/18 : Candidate stellar bowshock nebulae (Kobulnicky+, 2016)J/A+A/594/A82 : XMM sources in IC 1805 (Rauw+, 2016)J/ApJ/833/193 : MYStIX candidate protostars (Romine+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/838/61https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/838/61http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/838/61https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/838/61https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/838/61http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/838/61GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/838/61/table1 (MYStIX cluster data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/61/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/61/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/61/table1?GETtext/xml+votable180.050000true85.4327-1.89910.005555555555555556Cone search capability for table J/ApJ/838/61/table3 (Candidate X-ray-emitting OB stars from SED fitting)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/61/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/61/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/61/table3?GETtext/xml+votable180.050000true270.7832083-24.39863890.005555555555555556Cone search capability for table J/ApJ/838/61/table4 (Secondary candidate X-ray-emitting OB stars from NIR photometry)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/61/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/61/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/61/table4?GETtext/xml+votable180.050000true98.2624.60472220.005555555555555556Cone search capability for table J/ApJ/838/61/table2 (Previously cataloged OB stars among MYStIX Probable Complex Member (MPCMs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/838/61/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/838/61/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/838/61/table2?GETtext/xml+votable180.050000true85.4077083-1.91013890.0055555555555555566/1285 1287 1298 3307 3649 14704 22243 22249 22855 23637 28890 28891 28913 29116 29118 29461 29463 29506 30341 37872 37884 37923 37926 39907 42456 42457 42458 42460 424622.0616683193919197e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/838/61?format=asciiX-rayInfrareddefaultJ/ApJ/838/61/table1MYStIX cluster datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterMYStIX Cluster Namemeta.id;meta.maincharNobmeta.numberintnullableGLONGalactic Longitudedegpos.galactic.lonGLATGalactic Latitudedegpos.galactic.latDist[0.4/3.6] Distancekpcpos.distance;pos.heliocentricfloatESpTEarliest spectral typesrc.spTypecharAv[12/42] Max visual extinctionmagphys.absorption;stat.maxintSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexedJ/ApJ/838/61/table3Candidate X-ray-emitting OB stars from SED fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMOBcMYStIX OB Candidate Namemeta.idcharB13Display data from Broos+, 2013, J/ApJS/209/32meta.ref.urlintnullableMPCMMPCM IAU source name (HHMMSS.ss+DDMMSS.s; J2000), Broos+ (2013, J/ApJS/209/32)meta.id;meta.maincharAv[2/40] Interstellar extinction, assuming ZAMS objectmagphys.absorptionfloatTeff[25.7/44.1] Stellar effective temperature, assuming ZAMS objectkKphys.temperature.effectivefloatlogLbol[4/6] Bolometric luminosity, assuming ZAMS objectlog(solLum)phys.luminosityfloatSpitzerSpitzer MIR source name (GLLL.llll+BB.bbbb) (1)meta.id.crosscharJmag[7.9/21.5]? 2MASS or UKIRT J band magnitudemagphot.mag;em.IR.JfloatnullableHmag[7/16.6]? 2MASS or UKIRT H band magnitudemagphot.mag;em.IR.HfloatnullableKsmag[6.9/14]? 2MASS or UKIRT Ks band magnitudemagphot.mag;em.IR.Kfloatnullable3.6mag[6.9/13.7]? Spitzer/IRAC 3.6um band magnitude (1)magphot.mag;em.IR.3-4umfloatnullable4.5mag[6.7/13.7]? Spitzer/IRAC 4.5um band magnitude (1)magphot.mag;em.IR.4-8umfloatnullable5.8mag[6.6/13.7]? Spitzer/IRAC 5.8um band magnitude (1)magphot.flux.density;em.IR.4-8umfloatnullable8.0mag[6.6/13.1]? Spitzer/IRAC 8.0um band magnitude (1)magphot.flux.density;em.IR.8-15umfloatnullableOriProvenance of the NIR photometry ("T"woMASS or "U"KIRT)meta.codecharNotesOther ID/Spectral type (2)meta.notecharScatDisplay data within 2" in Kuhn+, 2013, J/ApJS/209/29 and GLIMPSE (II/293)meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from MPCM names (right ascension part)degpos.eq.ra;meta.main_DEPositions from MPCM names (declination part)degpos.eq.dec;meta.mainJ/ApJ/838/61/table4Secondary candidate X-ray-emitting OB stars from NIR photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMOBcMYStIX OB Secondary Candidate Namemeta.idcharB13Display data from Broos+, 2013, J/ApJS/209/32meta.ref.urlintnullableMPCMMPCM IAU source name (HHMMSS.ss+DDMMSS.s; J2000), Broos+ (2013, J/ApJS/209/32)meta.id;meta.maincharAv[6/38]? Interstellar extinction, assuming ZAMS object (1)magphys.absorptionfloatnullableJMag[-4.5/-2.4]? Absolute J band magnitude, assuming ZAMS object (1)magphys.magAbsfloatnullableJmag[8.2/18.7] 2MASS or UKIRT J band magnitudemagphot.mag;em.IR.JfloatHmag[7.4/14.9] 2MASS or UKIRT H band magnitudemagphot.mag;em.IR.HfloatKsmag[6.2/12.8] 2MASS or UKIRT Ks band magnitudemagphot.mag;em.IR.Kfloate_Jmag[0.01/0.06] Uncertainty in Jmagmagstat.error;phot.magfloate_Hmag[0.01/0.06] Uncertainty in Hmagmagstat.error;phot.magfloate_Ksmag[0/0.06] Uncertainty in Ksmagmagstat.error;phot.magfloatOri[TU] Provenance of the NIR photometry (from "T"woMASS or "U"KIRT)meta.codecharNotesOther ID/Spectral type (2)meta.notechar2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from MPCM names (right ascension part)degpos.eq.ra;meta.main_DEPositions from MPCM names (declination part)degpos.eq.dec;meta.mainJ/ApJ/838/61/table2Previously cataloged OB stars among MYStIX Probable Complex Member (MPCMs)SimbadNameSimbad column added by the CDSmeta.idcharTeff[15/44.5] SpT based effective temperature (2)kKphys.temperature.effectivefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterMYStIX Cluster Namemeta.id.parentcharMPCMMPCM IAU source name (HHMMSS.ss+DDMMSS.s; J2000), Broos+ (2013, J/ApJS/209/32)meta.id;meta.maincharm_MPCM[ab] Multiple MPCM name componentmeta.code.multipcharStarSimbad star namemeta.idcharSpTMK Spectral Type(s)src.spTypecharr_SpTLiterature reference for spectral type (1)meta.ref;pos.frameintAv[0/39.6]? Total line-of-sight extinction from SED fitmagphys.absorptionfloatnullablelogLbol[2.5/6.3]? log bolometric luminosity from SED fitlog(solLum)phys.luminosityfloatnullablef_logLbolFlag on logLbol (3)meta.codecharCatSpitzer source Catalog (4)meta.notecharSpitzerSpitzer source name (GLLL.llll+BB.bbbb)meta.id.crosscharJmag[4.7/19.3]? 2MASS or UKIRT J band magnitudemagphot.mag;em.IR.JfloatnullableHmag[4.7/16.4]? 2MASS or UKIRT H band magnitudemagphot.mag;em.IR.Hfloatnullablef_Hmag[*] * = Photometry datapoint excluded from SED fitmeta.codecharKsmag[4.7/13.4]? 2MASS or UKIRT Ks band magnitudemagphot.mag;em.IR.Kfloatnullable3.6mag[5/12.6]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablef_3.6mag[*] * = Photometry datapoint excluded from SED fitmeta.codechar4.5mag[4.8/13]? Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloatnullablef_4.5mag[*] * = Photometry datapoint excluded from SED fitmeta.codechar5.8mag[3/12.1]? Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablef_5.8mag[*] * = Photometry datapoint excluded from SED fitmeta.codechar8.0mag[1/12.2]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablef_8.0mag[*] * = Photometry datapoint excluded from SED fitmeta.codecharOriSource of JHK mag in each band (from "T"woMASS or "U"KIRT)meta.codecharXIREX-ray/IR Excess flag(s) (5)meta.codecharSEDSED Candidate flag (6)meta.codecharmkDisplay data within 3" in Skiff, 2009-2016, Cat. B/mkmeta.ref.urlintnullableScatDisplay data within 2" in Kuhn+, 2013, J/ApJS/209/29 and GLIMPSE (II/293)meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlchar_RAPositions from MPCM names (right ascension part)degpos.eq.ra;meta.main_DEPositions from MPCM names (declination part)degpos.eq.dec;meta.main