J/A+A/648/A65ivo://CDS.VizieR/J/A+A/648/A65doi:10.26093/cds/vizier.36480065CDSCastro N.Crowther P.A.Evans C.J.Vink J.S.Puls J.Herrero A.,Garcia M.Selman F.J.Roth M.M.Simon-Diaz S.2022-11-29T15:08:13Z2021-04-13T07:56:05ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsopen-star-clustersearly-type-starsob-starsstellar-masseseffective-temperatureWe present the spectroscopic analysis of 333 OB-type stars extracted from VLT-MUSE observations of the central 30x30pc of NGC 2070 in the Tarantula Nebula on the Large Magellanic Cloud, the majority of which are analysed for the first time. The distribution of stars in the spectroscopic Hertzsprung-Russell diagram (sHRD) shows 281 stars in the main sequence. We find two groups in the main sequence, with estimated ages of 2.1+/-0.8 and 6.2+/-2Myr. A subgroup of 52 stars is apparently beyond the main sequence phase, which we consider to be due to emission-type objects and/or significant nebular contamination affecting the analysis. As in previous studies, stellar masses derived from the sHRD are systematically larger than those obtained from the conventional HRD, with the differences being largest for the most massive stars. Additionally, we do not find any trend between the estimated projected rotational velocity and evolution in the sHRD. The projected rotational velocity distribution presents a tail of fast rotators that resembles findings in the wider population of 30 Doradus. We use published spectral types to calibrate the HeI{lambda}4921/HeII{lambda}5411 equivalent-width ratio as a classification diagnostic for early-type main sequence stars when the classical blue-visible region is not observed. Our model-atmosphere analyses demonstrate that the resulting calibration is well correlated with effective temperature.2021A&A...648A..65Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/648/A65CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/614/A147 : NGC 2070 point sources radial velocities (Castro+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/648/A65https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/648/A65http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/648/A65https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/648/A65https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/648/A65http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/648/A65GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/648/A65/table2 (OB in NGC2070 analysed in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/648/A65/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/648/A65/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/648/A65/table2?GETtext/xml+votable180.050000true84.6708-69.09870.0055555555555555566/330943.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/648/A65?format=asciidefaultJ/A+A/648/A65/table2OB in NGC2070 analysed in this workNote[*] Note (2)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMUSEIdentification and coordinates from Castro et al. (2018A&A...614A.147C, Cat. J/A+A/614/A147), [CCE2018] NNNN in Simbadmeta.id;meta.mainintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainlogTefflog effective temperaturelog(K)phys.temperature.effectivefloate_logTeffrms uncertainty in logTefflog(K)stat.error;phys.temperature.effectivefloatlogLslog spectroscopic luminosity (1)log(solLum)phys.luminosityfloate_logLsrms uncertainty in logLslog(solLum)stat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlcharlogLlog luminositylog(solLum)phys.luminosityfloate_logLrms uncertainty in logLlog(solLum)stat.errorfloatAvExtinctionmagphys.absorptionfloatVmagVisual magnitude (Castro et al., 2018A&A...614A.147C)magphot.mag;em.opt.VfloatlogMassLs? log estimated mass in the spectroscopic Hertzsprung-Russell diagram (sHRD)(1) (3)log(solMass)phys.massintnullablelogMassL? log estimated mass in the Hertzsprung-Russell diagram (HRD) (3)log(solMass)phys.massintnullableAgeLs? Age estimated from positions in the sHRD (1) (3)Myrtime.agefloatnullablevsiniProjected rotational velocitykm/sphys.veloc.rotatintSpTypeSpectral types derived according to the HeI 4921 to HeII 5411 ratiosrc.spTypechar