J/A+A/440/121ivo://CDS.VizieR/J/A+A/440/121doi:10.26093/cds/vizier.34400121CDSBik A.Kaper L.Hanson M.M.Smits M.2017-10-12T13:00:13Z2013-07-10T15:44:14ZCDS support team

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

cds-question@unistra.frh-ii-regionsearly-type-starsinfrared-photometryWe have obtained high resolution (R=10000) K-band spectra of candidate young massive stars deeply embedded in (ultra-) compact HII regions (UCHIIs). These objects were selected from a near-infrared survey of 44 fields centered on IRAS sources with UCHII colours. Often, the near-infrared counterpart of the IRAS source is a young embedded cluster hosting massive stars. In these clusters, three types of objects are identified. The first type (38 objects) consists of "naked" OB stars whose K-band spectra are dominated by photospheric emission. We classify the K-band spectra of the OB-type cluster members using near-infrared classification criteria. A few of them have a very early (O3-O4 V) spectral type, consistent with a young age of the embedded clusters. The spectral classification provides an important constraint on the distance to the embedded cluster.2005A&A...440..121Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/440/121CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/440/121https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/440/121http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/440/121https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/440/121https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/440/121http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/440/121GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/440/121/table6 (Identification of the OB stars and observing log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/440/121/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/440/121/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/440/121/table6?GETtext/xml+votable180.050000true92.2255821.640180.0055555555555555566/21456 21510 22045 22078 24325 28830 28890 28912 29091 30262 30318 30328 30618 30644 37366 37850 37872 37884 37923 41820 42169 42172 42398 42436 42447 42449 42456 42498 430197.952274030004205e-20 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/440/121?format=asciiInfrareddefaultJ/A+A/440/121/table6Identification of the OB stars and observing logSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIRASAssociated IRAS point-source (HHMMm+DDMM)meta.id.assoccharSource[43/6909]? Source number <[BKH2005] HHMMmnrNNNNA> in Simbadmeta.id;meta.mainintnullablem_Source[A] Multiplicity index on Sourcemeta.code.multipcharn_Source[+] +: source slightly extended, no point source photometry was possiblemeta.notecharClassObject classification (1)meta.code.class;src.classcharTexpTotal integration timestime.epochintS/NObtained signal-to-noise ratiostat.snrintStdObserved standard star used to remove the telluric linesmeta.idcharKmag? K-band magnitude (2)magphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullablel_J-K[>= ] Limit flag on J-Kmeta.code.error;phot.color;em.IR.JcharJ-K? J-K colour index (2)magphot.color;em.IR.J;em.IR.Kfloatnullablee_J-K? rms uncertainty on J-Kmagstat.error;phot.color;em.IR.Jfloatnullable_RAPosition of the IRAS source (right ascension part)degpos.eq.ra;meta.main_DEPosition of the IRAS source (declination part)degpos.eq.dec;meta.main