J/A+A/589/A16ivo://CDS.VizieR/J/A+A/589/A16doi:10.26093/cds/vizier.35890016CDSWu S.-W.Bik A.Bestenlehner J.M.Henning T.Pasquali A.Brandner W.,Stolte A.2023-12-21T15:49:42Z2016-04-06T08:16:36ZCDS support team

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

cds-question@unistra.frstellar-associationsob-starsyoung-stellar-objectsspectroscopyMassive stars form on different scales ranging from large, dispersed OB associations to compact, dense starburst clusters. The complex structure of regions of massive star formation, and the involved short timescales provide a challenge for our understanding of their birth and early evolution. As one of the most massive and luminous star- forming region in our Galaxy, W49 is the ideal place to study the formation of the most massive stars. By classifying the massive young stars deeply embedded into the molecular cloud of W49, we aim to investigate and trace the star formation history of this region. We analyse near-infrared K-band spectroscopic observations of W49 from LBT/LUCI combined with JHK images obtained with NTT/SOFI and LBT/LUCI. Based on JHK -band photometry and K-band spectroscopy the massive stars are placed in a Hertzsprung Russell diagram. By comparison with evolutionary models, their age and hence the star formation history of W49 can be investigated.2016A&A...589A..16Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/589/A16CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/589/A16https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/589/A16http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/589/A16https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/589/A16https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/589/A16http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/589/A16GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/589/A16/tablea1 (Spectroscopically observed massive stars in W49 and informations of fits spectrum files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/589/A16/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/589/A16/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/589/A16/tablea1?GETtext/xml+votable180.050000true287.57259.1058330.0055555555555555566/30618https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/589/A16?format=asciidefaultJ/A+A/589/A16/tablea1Spectroscopically observed massive stars in W49 and informations of fits spectrum filesn_ObsDate3[y] Note on ObsDate3 (1)meta.notecharObsDate4Fourth observation datetime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintNameSource IDmeta.id;meta.maincharn_Name[y] Note on Name (1)meta.notecharRAJ2000right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKmagK magnitudemagphot.mag;em.IR.Kfloate_Kmagrms uncertainty on Kmagmagstat.error;phot.magfloatClassClassificationsrc.classcharspShow the spectrummeta.ref.urlcharObsDate1Observation date of fits spectrum filetime.epochnullableObsDate2Second observation datetime.epochnullablen_ObsDate2[y] Note on ObsDate2 (1)meta.notecharObsDate3Third observation datetime.epochnullablen_ObsDate4[y] Note on ObsDate4 (1)meta.notecharSimbadNameSimbad column added by the CDSmeta.idcharnullableNxNumber of pixels along X-axis of fits spectrum filemeta.numberintblambdaLower value of spectral interval of fits spectrum file0.1nminstr.bandwidthfloatBlambdaUpper value of spectral interval of fits spectrum file0.1nminstr.bandwidthfloatdlambdaSpectral resolution of fits spectrum file0.1nmspect.resolutiondoublesizeSize of fits spectrum fileKibytephys.size;meta.fitsintFileNameName of fits spectrum file, in subdirectory spmeta.id;meta.fitschar