J/A+A/601/A79ivo://CDS.VizieR/J/A+A/601/A79doi:10.26093/cds/vizier.36010079CDSSabin-Sanjulian C.Simon-Diaz S.Herrero A.Puls J.Schneider F.R.N.,Evans C.J.Garcia M.Najarro F.Brott I.Castro N.Crowther P.A.,de Koter A.de Mink S.E.Grafener G.Grin N.J.Holgado G.Langer N.,Lennon D.J.Maiz Apellaniz J.Ramirez-Agudelo O.H.Sana H.Taylor W.D.,Vink J.S.Walborn N.R.2018-06-01T07:08:47Z2017-05-09T06:16:57ZCDS support team

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

cds-question@unistra.frmagellanic-cloudso-starsdwarf-starseffective-temperatureThe VLT-FLAMES Tarantula Survey has observed hundreds of O-type stars in the 30 Doradus region of the Large Magellanic Cloud (LMC). We study the properties of 105 apparently single O-type dwarfs. To determine stellar and wind parameters, we used the IACOB-GBAT package, an automatic procedure based on a large grid of atmospheric models calculated with the FASTWIND code. In addition to classical techniques, we applied the Bayesian BONNSAI tool to estimate evolutionary masses. We provide a new calibration of effective temperature vs. spectral type for O-type dwarfs in the LMC, based on our homogeneous analysis of the largest sample of such objects to date and including all spectral subtypes. Good agreement with previous results is found, although the sampling at the earliest subtypes could be improved. Rotation rates and helium abundances are studied in an evolutionary context. We find that most of the rapid rotators (vsini higher than 300km/s) in our sample have masses below 25 MSun and intermediate rotation-corrected gravities (logg_c_ between 3.9 and 4.1). Such rapid rotators are scarce at higher gravities (i.e. younger ages) and absent at lower gravities (larger ages). This is not expected from theoretical evolutionary models, and does not appear to be due to a selection bias in our sample. We compare the estimated evolutionary and spectroscopic masses, finding a trend that the former is higher for masses below 20M_{sun}_. This can be explained as a consequence of limiting our sample to the O-type stars, and we see no compelling evidence for a systematic mass discrepancy. For most of the stars in the sample we were unable to estimate the wind-strength parameter (hence mass-loss rates) reliably, particularly for objects with luminosity lower than logL/L_{sun}_ about 5.1. Ultraviolet spectroscopy is needed to undertake a detailed investigation of the wind properties of these dwarfs.2017A&A...601A..79Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/601/A79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/530/A108 : VLT-FLAMES Tarantula Survey (Evans+, 2011)J/A+A/550/A107 : VLTS. RV catalogue of O stars in 30 Doradus (Sana+, 2013)J/A+A/550/A108 : DIB in VLT-FLAMES Tarantula Survey (van Loon+, 2013)J/A+A/550/A109 : VLTS: vsini measures (Dufton+ 2013)J/A+A/558/A134 : VLTS. 30 Dor luminous stars (Doran+, 2013)J/A+A/560/A29 : O-stars in VLT-FLAMES Tarantula Survey (Ramirez-Agudelo+ 2013)J/A+A/564/A39 : VLTS. OVz stars in 30 Dor (Sabin-Sanjulian+, 2014)J/A+A/564/A40 : VFTS. O-type stellar content of 30 Dor (Walborn+, 2014)J/A+A/564/L7 : VLT-FLAMES Tarantula Survey: VFTS 822 (Kalari+, 2014)J/A+A/575/A70 : VFTS. B-type supergiants (McEvoy+, 2015)J/A+A/580/A93 : VLTS. B stars multiplicity (Dunstall+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/601/A79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/601/A79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/601/A79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/601/A79https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/601/A79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/601/A79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/601/A79/tableab1 (Stellar and wind parameters (table A1) and radii, luminosities and masses (table A2) for stars analyzed with HHe diagnostics)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/601/A79/tableab1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/601/A79/tableab1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/601/A79/tableab1?GETtext/xml+votable180.050000true84.2817469-69.085060.005555555555555556Cone search capability for table J/A+A/601/A79/tableab2 (Stellar and wind parameters (table B1) and radii, luminosities and masses (table B2) for stars analyzed with HHeN diagnostics)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/601/A79/tableab2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/601/A79/tableab2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/601/A79/tableab2?GETtext/xml+votable180.050000true84.3935875-69.01950.0055555555555555566/33094https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/601/A79?format=asciidefaultJ/A+A/601/A79/tableab1Stellar and wind parameters (table A1) and radii, luminosities and masses (table A2) for stars analyzed with HHe diagnosticsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVFTSVLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E)meta.id;meta.mainintSpTypeSpectral classificationsrc.spTypecharvsiniProjected rotational velocitykm/sphys.veloc.rotatintTeffEffective temperatureKphys.temperature.effectiveinte_TeffMean error on effective temperatureKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatn_logg[*] Note on logg (1)meta.notecharloggc? Rotation-corrected gravity (G1)log(cm.s**-2)phys.gravityfloatnullablee_loggcMean error on gravity (minimum of 0.10)log(cm.s**-2)stat.errorfloatl_Y(He)Limit flag on Y(He)meta.code.errorcharY(He)Helium abundance N(He)/N(H) (error=0.02)phys.abund.Yfloatl_logQLimit flag on logQmeta.code.errorcharlogQWind-strength parameter (2)stat.fit.paramfloate_logQ? Mean error on logQstat.errorfloatnullablel_logDmomLimit flag on logDmommeta.code.errorcharlogDmom? Wind momentum (error=0.4)stat.fit.paramfloatnullableCommComments regarding possible binarity or multiplicity (G2)meta.code.multipcharVMag? Absolute magnitude in V (G3)magphys.magAbs;em.opt.VfloatnullableR? Stellar radiussolRadphys.size.radiusfloatnullablee_R? Mean error in RsolRadstat.errorfloatnullablelogL? Stellar luminositylog(solLum)phys.luminosityfloatnullablee_logL? Mean error in logLlog(solLum)stat.errorfloatnullableMsp? Spectroscopic masssolMassphys.massfloatnullablee_Msp? Mean error in MspsolMassstat.errorfloatnullableMev(GT)? Evolutionary mass from Kiel diagramsolMassphys.massfloatnullablee_Mev(GT)? Mean error on Mev(GT)solMassstat.errorfloatnullableMev(LT)? Evolutionary mass from HR diagramsolMassphys.massfloatnullablee_Mev(LT)? Mean error on Mev(LT)solMassstat.errorfloatnullableMev(B)? Evolutionary mass from BONNSAI (Schneider et al., 2014A&A...570A..66S)solMassphys.massfloatnullablee_Mev(B)? Mean error in Mev(B)solMassstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/601/A79/tableab2Stellar and wind parameters (table B1) and radii, luminosities and masses (table B2) for stars analyzed with HHeN diagnosticsl_logQLimit flag on logQmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintVFTSVLT-FLAMES Tarantula Survey identifier (2011A&A...530A.108E)meta.id;meta.mainintSpTypeSpectral classificationsrc.spTypecharvsiniProjected rotational velocitykm/sphys.veloc.rotatintTeffEffective temperature (adopted error of 1500K)Kphys.temperature.effectiveintloggSurface gravity (adopted error of 0.1)log(cm.s**-2)phys.gravityfloatloggcRotation-corrected gravity (G1)log(cm.s**-2)phys.gravityfloatlogQWind-strength parameter (adopted error of 0.20)stat.fit.paramfloatl_logDmomLimit flag on logDmommeta.code.errorcharlogDmomWind momentum (error=0.4)stat.fit.paramfloatCommComments regarding possible binarity or multiplicity (G2)meta.code.multipcharVMagAbsolute magnitude in V (G3)magphys.magAbs;em.opt.VfloatRStellar radiussolRadphys.size.radiusfloatlogLStellar luminositylog(solLum)phys.luminosityfloatMspSpectroscopic masssolMassphys.massfloatl_Mev(GT)? Limit flag on Mev(GT)meta.code.errorcharMev(GT)Evolutionary mass from Kiel diagramsolMassphys.massintMev(LT)Evolutionary mass from HR diagramsolMassphys.massintMev(B)Evolutionary mass from BONNSAI ( Schneider et al., 2014A&A...570A..66S)solMassphys.massfloate_Mev(B)Mean error in Mev(B)solMassstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main