J/A+A/665/A108ivo://CDS.VizieR/J/A+A/665/A108doi:10.26093/cds/vizier.36650108CDSMorel T.Blazere A.Semaan T.Gosset E.Zorec J.Fremat Y.Blomme R.,Daflon S.Lobel A.Nieva M.F.Przybilla N.Gebran M.Herrero A.,Mahy L.Santos W.Tautvaisiene G.Gilmore G.Randich S.Alfaro E.J.,Bergemann M.Carraro G.Damiani F.Franciosini E.Morbidelli L.,Pancino E.Worley C.C.Zaggia S.2023-11-07T10:31:43Z2022-09-15T08:25:35ZCDS support team

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

cds-question@unistra.fropen-star-clusterschemical-abundancesvisible-astronomyWe present a spectroscopic analysis of the GIRAFFE and UVES data collected by the Gaia-ESO survey for the young open cluster NGC 3293. Archive spectra from the same instruments obtained in the framework of the 'VLT-FLAMES survey of massive stars' are also analysed. Atmospheric parameters, non-local thermodynamic equilibrium (LTE) chemical abundances for six elements (He, C, N, Ne, Mg, and Si), or variability information are reported for a total of about 160 B stars spanning a wide range in terms of spectral types (B1 to B9.5) and rotation rate (up to 350km/s). Our analysis leads to about a five-fold increase in the number of cluster members with an abundance determination and it characterises the late B-star population in detail for the first time. We take advantage of the multi-epoch observations on various timescales and a temporal baseline, sometimes spanning ~15 years, to detect several binary systems or intrinsically line-profile variables. A deconvolution algorithm is used to infer the current, true (deprojected) rotational velocity distribution. We find a broad, Gaussian-like distribution peaking around 200-250km/s. Although some stars populate the high-velocity tail, most stars in the cluster appear to rotate far from critical. We discuss the chemical properties of the cluster, including the low occurrence of abundance peculiarities in the late B stars and the paucity of objects showing CN-cycle burning products at their surface. We argue that the former result can largely be explained by the inhibition of diffusion effects because of fast rotation, while the latter is generally in accord with the predictions of single-star evolutionary models under the assumption of a wide range of initial spin rates at the onset of main-sequence evolution. However, we find some evidence for a less efficient mixing in two quite rapidly rotating stars that are among the most massive objects in our sample. Finally, we obtain a cluster age of ~20Myrs through a detailed, star-to-star correction of our results for the effect of stellar rotation (e.g. gravity darkening). This is significantly older than previous estimates from turn-off fitting that fully relied on classical, non-rotating isochrones.2022A&A...665A.108Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/665/A108CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/402/549 : UBVRIHalpha photometry of NGC 3293 (Baume+, 2003)J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005)J/A+A/457/265 : The VLT-FLAMES Survey of Massive Stars (Dufton+, 2006)J/A+A/462/591 : CCD {Delta}a-photometry of 8 open clusters (Netopil+, 2007)J/A+A/605/A85 : NGC 3293 Chandra X-ray observation (Preibisch+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/665/A108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/665/A108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/665/A108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/665/A108https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/665/A108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/665/A108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/665/A108/table4 (Final apparent parameters and abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/665/A108/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/665/A108/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/665/A108/table4?GETtext/xml+votable180.050000true158.5497917-58.21850.0055555555555555566/19676 21730 22893 23776 37231 38018-38019 38024-38025 42948https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/665/A108?format=asciiOpticaldefaultJ/A+A/665/A108/table1Summary of observations and sampling propertiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGESGaia-ESO ID (HHMMSSss+DDMMSSs)meta.id;meta.maincharNameMain SIMBAD IDmeta.idcharFSVLT-FLAMES survey of massive stars ID (NNNN-NNN)meta.idcharNbHR03FSNumber of epochs FS HR03meta.numberintNbHR03GESNumber of epochs GES HR03meta.numberintNbHR04FSNumber of epochs FS HR04meta.numberintNbHR04GESNumber of epochs GES HR04meta.numberintNbHR05FSNumber of epochs FS HR05meta.numberintNbHR05GESNumber of epochs GES HR05meta.numberintNbHR06FSNumber of epochs FS HR06meta.numberintNbHR06GESNumber of epochs GES HR06meta.numberintNbU520FSNumber of epochs FS U520meta.numberintNbU520GESNumber of epochs GES U520meta.numberintNbTotal number of epochsmeta.numberintDeltaTTotal time spandtime.intervalfloatJ/A+A/665/A108/table4Final apparent parameters and abundances_RAPositions from GES name (right ascension part)degpos.eq.ra;meta.main_DEPositions from GES name (declination part)degpos.eq.dec;meta.mainvsini? Projected rotational velocitykm/sphys.veloc.rotatintnullableloge(MgII)? Magnesium abundancephys.abundfloatnullablee_loge(MgII)? Uncertainty magnesium abundancestat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGESGaia-ESO IDmeta.id;meta.maincharNameMain SIMBAD IDmeta.idcharFSVLT-FLAMES survey of massive stars IDmeta.idcharfMember[Y N ?] Membership flagmeta.code.membercharTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Uncertainty effective temperatureKstat.error;phys.temperature.effectiveintnullablef_Teff? Flag effective temperature (1)meta.codeintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Uncertainty surface gravitylog(cm.s**-2)stat.errorfloatnullablef_logg? Flag surface gravity (1)meta.codeintnullablee_vsini? Uncertainty projected rotational velocitykm/sstat.error;phys.veloc.rotatintnullablef_vsini? Flag projected rotational velocity (1)meta.codeintnullableRV? Mean radial velocitykm/sphys.veloc;pos.heliocentricfloatnullables_RV? Dispersion radial velocitieskm/sinstr.dispersionfloatnullablee_RV? Uncertainty mean radial velocitykm/sstat.errorfloatnullableHE1? Helium abundancephys.abund.Yfloatnullablee_HE1? Uncertainty helium abundancestat.errorfloatnullablef_HE1? Flag helium abundance (1)meta.codeintnullableloge(CII)? Carbon abundancephys.abundfloatnullablee_loge(CII)? Uncertainty carbon abundancestat.errorfloatnullablef_loge(CII)? Flag carbon abundance (1)meta.codeintnullableloge(NII)? Nitrogen abundancephys.abundfloatnullablee_loge(NII)? Uncertainty nitrogen abundancestat.errorfloatnullablef_loge(NII)? Flag nitrogen abundance (1)meta.codeintnullableloge(NeI)? Neon abundancephys.abundfloatnullablee_loge(NeI)? Uncertainty neon abundancestat.errorfloatnullablef_loge(NeI)? Flag neon abundance (1)meta.codeintnullablef_loge(MgII)? Flag magnesium abundance (1)meta.codeintnullableloge(SiII)? Silicon abundance from SiII linesphys.abundfloatnullablee_loge(SiII)? Uncertainty silicon abundance from SiII linesstat.errorfloatnullablef_loge(SiII)? Flag silicon abundance from SiII lines (1)meta.codeintnullableloge(SiIII)? Silicon abundance from SiIII linesphys.abundfloatnullablee_loge(SiIII)? Uncertainty silicon abundance from SiIII linesstat.errorfloatnullablef_loge(SiIII)? Flag silicon abundance from SiIII lines (1)meta.codeintnullable[N/C]? Nitrogen over carbon abundance ratiophys.abundfloatnullablee_[N/C]? Uncertainty nitrogen over carbon abundance ratiostat.error;phys.abundfloatnullablef_[N/C]? Flag nitrogen over carbon abundance ratio (1)meta.codeintnullablefGES-TECHGaia-ESO technical flag (2)meta.codecharfGES-PECULIGaia-ESO stellar peculiarity flag (2)meta.codecharJ/A+A/665/A108/table5Colour excesses and stellar parametersttMSappApparent fraction of main-sequence lifetimetime.agefloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGESGaia-ESO IDmeta.id;meta.maincharE(B-V)B-V colour excessmagphot.color.excessfloate_E(B-V)Uncertainty colour excessmagstat.errorfloatTeffpnrcpnrc effective temperatureKphys.temperature.effectiveinte_TeffpnrcUncertainty pnrc effective temperatureKstat.errorintloggpnrcpnrc surface gravitylog(cm.s**-2)phys.gravityfloate_loggpnrcUncertainty pnrc surface gravitylog(cm.s**-2)stat.errorfloatlogLpnrcpnrc luminositylog(solLum)phys.luminosityfloate_logLpnrcUncertainty pnrc luminositylog(solLum)stat.errorfloatvsinipnrcpnrc projected rotational velocitykm/sphys.veloc.rotatinte_vsinipnrcUncertainty pnrc projected rotational velocitykm/sstat.errorintMpnrcpnrc masssolMassphys.massfloate_MpnrcUncertainty pnrc masssolMassstat.errorfloatVcpnrcpnrc critical velocitykm/sphys.velocinte_VcpnrcUncertainty pnrc critical velocitykm/sstat.errorintipnrcpnrc inclination angledegsrc.orbital.inclinationinte_ipnrcUncertainty pnrc inclination angledegstat.errorintV/Vcpnrcpnrc V over Vcphys.velocfloate_V/VcpnrcUncertainty pnrc V over Vcstat.errorfloatomegapnrcpnrc omega (ratio of the current to the critical surface angular velocity)stat.fit.paramfloate_omegapnrcUncertainty pnrc omegastat.errorfloatttMSpnrcpnrc fraction of main-sequence lifetimetime.agefloate_ttMSpnrcUncertainty pnrc fraction of main-sequence lifetimestat.errorfloatlogtpnrcpnrc agelog(yr)time.agefloate_logtpnrcUncertainty pnrc agelog(yr)stat.errorfloatlogTeffavgAverage effective temperaturelog(K)phys.temperature.effective;stat.meanfloate_logTeffavgUncertainty average effective temperaturelog(K)stat.errorfloatloggavgAverage surface gravitylog(cm.s**-2)phys.gravity;stat.meanfloate_loggavgUncertainty average surface gravitylog(cm.s**-2)stat.errorfloatlogLavgAverage luminositylog(solLum)phys.luminosityfloate_logLavgUncertainty average luminositylog(solLum)stat.errorfloate_TeffappUncertainty apparent effective temperatureKstat.errorintlogLappApparent luminositylog(solLum)phys.luminosityfloate_logLappUncertainty apparent luminositylog(solLum)stat.errorfloate_ttMSappUncertainty apparent fraction of main-sequence lifetimestat.errorfloatlogtappApparent agelog(yr)time.agefloate_logtappUncertainty apparent agelog(yr)stat.errorfloatTeffappApparent effective temperatureKphys.temperature.effectiveint