J/MNRAS/477/2068ivo://CDS.VizieR/J/MNRAS/477/2068doi:10.26093/cds/vizier.74772068CDSKiminki M.M.Smith N.2024-08-18T20:19:00Z2018-06-19T08:32:59ZCDS support team

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

cds-question@unistra.frstellar-associationso-starsradial-velocityWe have obtained multi-epoch observations of 31 O-type stars in the Carina Nebula using the CHIRON spectrograph on the CTIO/SMARTS 1.5-m telescope. We measure their radial velocities to 1-2 km/s precision and present new or updated orbital solutions for the binary systems HD 92607, HD 93576, HDE 303312, and HDE 305536. We also compile radial velocities from the literature for 32 additional O-type and evolved massive stars in the region. The combined data set shows a mean heliocentric radial velocity of 0.6km/s. We calculate a velocity dispersion of <=9.1km/s, consistent with an unbound, substructured OB association. The Tr 14 cluster shows a marginally significant 5km/s radial velocity offset from its neighbour Tr 16, but there are otherwise no correlations between stellar position and velocity. The O-type stars in Cr 228 and the South Pillars region have a lower velocity dispersion than the region as a whole, supporting a model of distributed massive star formation rather than migration from the central clusters. We compare our stellar velocities to the Carina Nebula's molecular gas and find that Tr 14 shows a close kinematic association with the Northern Cloud. In contrast, Tr 16 has accelerated the Southern Cloud by 10-15km/s, possibly triggering further massive star formation. The expansion of the surrounding H II region is not symmetric about the O-type stars in radial velocity space, indicating that the ionized gas is constrained by denser material on the far side.2018MNRAS.477.2068Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/477/2068CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/82 : Galactic O-type Stars (Garmany+ 1982)J/A+A/549/A67 : Embedded YSOs in Carina Nebula complex (Gaczkowski+, 2013)J/A+A/567/A109 : Carina nebula optically identified YSOs (Kumar+, 2014)J/A+A/603/A81 : Trumpler 14 and 16 in the Carina nebula (Damiani+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/477/2068https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/477/2068http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/477/2068https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/477/2068https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/477/2068http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/477/2068GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/477/2068/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/477/2068/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/477/2068/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/477/2068/stars?GETtext/xml+votable180.050000true160.9218333-59.59672220.0055555555555555566/37333 37335 38016https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/477/2068?format=asciidefaultJ/MNRAS/477/2068/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name used in the Galactic O-Star Catalogmeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNNumber of radial velocity measurements in table2meta.numberintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/477/2068/table2CHIRON radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name used in the Galactic O-Star Catalogmeta.id;meta.maincharHJDHeliocentric Julian date (HJD-2400000) at midpoint of exposuredtime.epochdoubleRV1Radial velocity of primary starkm/sspect.dopplerVelocfloate_RV1One-sigma uncertainty on RV1km/sstat.errorfloatRV2? Radial velocity of secondary star (where present)km/sspect.dopplerVelocfloatnullablee_RV2? One-sigma uncertainty on RV2km/sstat.errorfloatnullable