J/MNRAS/454/28ivo://CDS.VizieR/J/MNRAS/454/28doi:10.26093/cds/vizier.74540028CDSMugnes J.-M.Robert C.2024-08-15T20:16:02Z2017-01-03T15:06:15ZCDS support team

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

cds-question@unistra.frb-starseffective-temperatureSpectral analysis is a powerful tool to investigate stellar properties and it has been widely used for decades now. However, the methods considered to perform this kind of analysis are mostly based on iteration among a few diagnostic lines to determine the stellar parameters. While these methods are often simple and fast, they can lead to errors and large uncertainties due to the required assumptions. Here, we present a method based on Bayesian statistics to find simultaneously the best combination of effective temperature, surface gravity, projected rotational velocity, and microturbulence velocity, using all the available spectral lines. Different tests are discussed to demonstrate the strength of our method, which we apply to 54 mid-resolution spectra of field and cluster B stars obtained at the Observatoire du Mont-Megantic. We compare our results with those found in the literature. Differences are seen which are well explained by the different methods used. We conclude that the B-star microturbulence velocities are often underestimated. We also confirm the trend that B stars in clusters are on average faster rotators than field B stars.2015MNRAS.454...28Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/28CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/648/591 : Stellar rotation in young clusters. II. (Huang+, 2006)J/ApJ/648/580 : Rotational velocities in 19 open clusters (Huang+, 2006)J/AJ/134/1570 : Rotational velocities of OB stars (Daflon+, 2007)J/ApJ/722/605 : A stellar rotation census of B stars (Huang+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/28https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/28http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/28https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/28https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/28http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/28GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/454/28/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/454/28/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/454/28/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/454/28/stars?GETtext/xml+votable180.050000true264.866208346.00633330.0055555555555555566/1300 1331 1338 1405 2619 2874 3256-3257 6887 7195 9680 12546 12914 12981 13033 13258 13535 13556 13559 14077 14541 14581 14625 14646 14654 14726 15376 15392 15417 15478 15677 15714 15747 19676 22059 22207 22645 22893 24510-24511 32174https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/454/28?format=asciidefaultJ/MNRAS/454/28/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name or Field for field starsmeta.id.parentcharStarStar namemeta.id;meta.maincharRAJ2000Simbad right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSNameSimbad namemeta.idcharJ/MNRAS/454/28/tablebBasic parameters of field and cluster B stars (tables B1-B11 of the paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTableOriginal table number (1)meta.id;meta.datasetcharClusterCluster name or Field for field starsmeta.id.parentcharStarStar namemeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveintE_Teff? Upper value of Teff errorKstat.error;stat.maxintnullablee_Teff? rms uncertainty ion Tefff or lower value of Teff errorKstat.error;phys.temperature.effectiveintnullableloggSurface gravitylog(cm.s**-2)phys.gravityfloatE_logg? Upper value of logg errorlog(cm.s**-2)stat.error;stat.maxfloatnullablee_logg? rms uncertainty on logg or lower value of logg errorlog(cm.s**-2)stat.errorfloatnullablevsiniRotational velocitykm/sphys.veloc.rotatintE_vsini? Upper value of vsini errorkm/sstat.error;stat.maxintnullablee_vsini? rms uncertainty on vsini or lower value of vsini errorkm/sstat.error;phys.veloc.rotatintnullablevturbMicroturbulent velocitykm/sphys.velocfloatE_vturb? Upper value of vtur errorkm/sstat.error;stat.maxfloatnullablee_vturb? rms uncertainty on vturb or lower value of vtur errorkm/sstat.errorfloatnullableRefReference (2)meta.ref;pos.framecharEl1Name of elementmeta.id;phys.atmol.elementcharlog(El1/H)+12? Abundance, log(El1/H)+12phys.abundfloatnullableEl2Name of elementmeta.id;phys.atmol.elementcharlog(El2/H)+12? Abundance, log(El2/H)+12phys.abundfloatnullableEl3Name of elementmeta.id;phys.atmol.elementcharlog(El3/H)+12? Abundance, log(El3/H)+12phys.abundfloatnullableEps(C)? C abundancephys.abundfloatnullableEps(N)? N abundancephys.abundfloatnullableEps(O)? O abundancephys.abundfloatnullableEps(Mg)? Mg abundancephys.abundfloatnullableEps(Si)? Si abundancephys.abundfloatnullable