J/MNRAS/465/1807ivo://CDS.VizieR/J/MNRAS/465/1807doi:10.26093/cds/vizier.74651807CDSMohr-Smith M.Drew J.E.Napiwotzki R.Simon-Diaz S.Wright N.J.,Barentsen G.Eisloeffel J.Farnhill H. J.Greimel R.Monguio M.,Kalari V.Parker Q.A.Vink J.S.2024-08-16T20:19:47Z2016-12-23T15:31:22ZCDS support team

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

cds-question@unistra.frgalaxy-planesmilky-way-galaxyearly-type-starsvisible-astronomysloan-photometryh-alpha-photometryinterstellar-reddeningMassive OB stars are critical to the ecology of galaxies, and yet our knowledge of OB stars in the Milky Way, fainter than V~12, remains patchy. Data from the VST Photometric H-alpha Survey (VPHAS+) permit the construction of the first deep catalogues of blue excess-selected OB stars, without neglecting the stellar field. A total of 14900 candidates with 2MASS cross-matches are blue-selected from a 42 square-degree region in the Galactic longitude range 282{deg}<l<293{deg} Spectral energy distribution fitting is performed on these candidates' combined VPHAS+ u/g/r/i and 2MASS J/H/K magnitudes. This delivers: effective temperature constraints, statistically separating O from early-B stars; high-quality extinction parameters, A_0_ and R_V_ (random errors typically <0.1). The high confidence O-B2 candidates number 5915 and a further 5170 fit to later B spectral type. Spectroscopy of 276 of the former confirms 97% of them. The fraction of emission line stars among all candidate B stars is 7-8%. Greyer (R_V_>3.5) extinction laws are ubiquitous in the region, over the distance range 2.5-3kpc to ~10kpc. Near prominent massive clusters, R_V_ tends to rise, with particularly large and chaotic excursions to R_V_~5 seen in the Carina Nebula. The data reveal a hitherto unnoticed association of 108 O-B2 stars around the O5If+ star LSS 2063 (l=289.77{deg}, b=-1.22{deg}). Treating the OB star scale-height as a constant within the thin disk, we find an orderly mean relation between extinction (A_0_) and distance in the Galactic longitude range, 287.6{deg}<l< 293.5{deg}, and infer the subtle onset of thin-disk warping. A halo around NGC 3603, roughly a degree in diameter, of ~500 O-B2 stars with 4<A_0_(mag)<7 is noted.2017MNRAS.465.1807Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/465/1807CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/341 : VPHAS+ DR2 survey (Drew+, 2016)J/ApJS/194/5 : Carina OB stars in the CCCP catalog (Gagne+, 2011)J/ApJS/194/7 : X-ray properties of O and B stars in Carina (Naze+, 2011)J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/465/1807https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/465/1807http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/465/1807https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/465/1807https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/465/1807http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/465/1807GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/465/1807/carinaob (Positions, photometry and derived parameters for the OB candidates.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/465/1807/carinaob?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/465/1807/carinaob?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/465/1807/carinaob?GETtext/xml+votable180.050000true151.82410889-56.516823890.0055555555555555564/2370 5/9311 9332-9333 9335 9341 9504-9506 6/37237 37239 37243 37336-37337 37361 37363 37372-37373 37898-37899 37902-37903 37914 37936 37944-37946 38028-38030 380481.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/465/1807?format=asciiOpticaldefaultJ/MNRAS/465/1807/carinaobPositions, photometry and derived parameters for the OB candidates.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVPHAS-OB1VPHAS_OB1_NNNNN where NNNNN is Galactic longitude ordered sequence numbermeta.id;meta.mainintRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic declinationdegpos.galactic.latdoubleumagu band magnitude (Vega)magphot.mag;em.opt.Ufloate_umagu band random errormagstat.error;phot.mag;em.opt.Ufloatgmagg band magnitude (Vega)magphot.mag;em.opt.Bfloate_gmagg band random errormagstat.error;phot.mag;em.opt.Bfloatrmagr band magnitude (Vega), taken with u,g measurements and used in SED fittingmagphot.mag;em.opt.Rfloate_rmagr band random errormagstat.error;phot.mag;em.opt.Rfloatr2mag? r band magnitude (Vega), taken with Ha,imagphot.mag;em.opt.Rfloatnullablee_r2mag? r2 band random errormagstat.error;phot.magfloatnullableimagi band magnitude (Vega)magphot.mag;em.opt.Ifloate_imagi band random errormagstat.error;phot.mag;em.opt.IfloatHamag? narrowband Ha magnitude (Vega)magphot.mag;em.line.Halphafloatnullablee_Hamag? Ha band random errormagstat.error;phot.mag;em.IR.HfloatnullableJmag2MASS J band magnitude (Vega)magphot.mag;em.IR.Jfloate_JmagJ band random errormagstat.error;phot.mag;em.IR.JfloatHmag2MASS H band magnitude (Vega)magphot.mag;em.IR.Hfloate_HmagH band random errormagstat.error;phot.mag;em.IR.HfloatKmag2MASS K band magnitude (Vega)magphot.mag;em.IR.Kfloate_KmagK band random errormagstat.error;phot.mag;em.IR.KfloatXmatchCross-match separation between VPHAS+ and 2MASS sky positionsarcsecpos.angDistancefloatlogTefflog(effective temperature) from SED fit (1)log(K)arith.zpfloatE_logTeffUpper uncertainty on logTeff (2)log(K)stat.error;stat.maxfloate_logTeffLower uncertainty on logTeff (3)log(K)stat.error;phys.temperature.effectivefloatA0Monochromatic extinction at 5495{AA}, from SED fit (1)magphys.absorptionfloatE_A0Upper uncertainty on A0 (2)magstat.error;stat.maxfloate_A0Lower uncertainty on A0 (3)magstat.errorfloatRvExtinction law parameter from SED fit (1)phys.absorptionfloatE_RvUpper uncertainty on Rv (2)stat.error;stat.maxfloate_RvLower uncertainty on Rv (3)stat.errorfloatmuDistance modulus from SED fit, if on the main sequence (1)magphot.mag.distModfloatE_muUpper uncertainty on mu (2)magstat.error;stat.maxfloate_muLower uncertainty on mu (3)magstat.errorfloatchi2chi-squared of SED fit, obtained for posterior median parameter valuesstat.fit.chi2;stat.fit.param;meta.modelledfloatgoodOB[0/1] if 1, chi2 < 7.82, otherwise 0meta.codeintEM[0/1] if 1, selected as likely emission line objects, otherwise 0meta.codeintSUB[0/1] if 1, star is a candidate subluminous object, otherwise 0meta.codeintLUM[0/1] if 1, star is a candidate higher-luminosity evolved object, otherwise 0meta.codeintNotesComments, including SIMBAD cross identification name where it existsmeta.notecharSPEC[0/1]? if 1, spectroscopic parameters are available, otherwise 0meta.codeintnullableSpecModIndicates source of model fit to AAOmega spectrum (FASTWIND or TLUSTY)meta.codecharlogTeffsp? log(effective temperature) from model atmosphere fit to spectrum (1)log(K)arith.zpfloatnullableE_logTeffsp? Upper uncertainty on speclogTeff (2)log(K)stat.error;stat.maxfloatnullablee_logTeffsp? Lower uncertainty on speclogTeff (3)log(K)stat.errordoublenullablelogg? Surface gravity from model atmosphere fit to spectrum (1)log(cm.s**-2)phys.gravityfloatnullableE_logg? Upper uncertainty on logg (2)log(cm.s**-2)stat.error;stat.maxdoublenullablee_logg? Lower uncertainty on logg (3)log(cm.s**-2)stat.errordoublenullablevsini? Projected rotational velocity from model atmosphere fit to spectrum (1)(4)km/sphys.veloc.rotatfloatnullableE_vsini? Upper uncertainty on vsini (2)(4)km/sstat.error;stat.maxfloatnullablee_vsini? Lower uncertainty on vsini (3)(4)km/sstat.error;phys.veloc.rotatfloatnullableVPHAS+Display the VPHAS+ DR2 (2016, Drew et al. Cat. II/341) datameta.ref.urlchar