J/A+A/609/A108ivo://CDS.VizieR/J/A+A/609/A108doi:10.26093/cds/vizier.36090108CDSShokry A.Rivinius T.Mehner A.Martayan C.Hummel W.Townsend R.H.D.,Merand A.Mota B.Faes D.M.Hamdy M.A.Beheary M.M.Gadallah K.A.K.,Abo-Elazm M.S.2018-03-12T09:01:24Z2018-01-25T08:06:14ZCDS support team

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

cds-question@unistra.frbe-starsstellar-masseseffective-temperatureThe X-shooter archive of several thousand telluric star spectra was skimmed for Be and Be-shell stars to derive the stellar fundamental parameters and statistical properties, in particular for the less investigated late type Be stars, and the extension of the Be phenomenon into early A stars. An adapted version of the BCD method is used, utilizing the Balmer discontinuity parameters to determine effective temperature and surface gravity. This method is optimally suited for late B stars. The projected rotational velocity was obtained by profile fitting to the Mgii lines of the targets, and the spectra were inspected visually for the presence of peculiar features such as the infrared Ca ii triplet or the presence of a double Balmer discontinuity. The Balmer line equivalent widths were measured, but due to uncertainties in determining the photospheric contribution are useful only in a subsample of Be stars for determining the pure emission contribution. A total of 78 Be stars, mostly late type ones, were identified in the X-shooter telluric standard star archive, out of which 48 had not been reported before. The general trend of late type Be stars having more tenuous disks and being less variable than early type ones is confirmed. The relatively large number (48) of relatively bright (V>8.5) additional Be stars casts some doubt on the statistics of late type Be stars; they are more common than currently thought: The Be/B star fraction may not strongly depend on spectral subtype.2018A&A...609A.108Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/609/A108CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/609/A108https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/609/A108http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/609/A108https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/609/A108https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/609/A108http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/609/A108GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/609/A108/table6Parameters of stellar models used to measure the theoretical values of the Balmer discontinuity parameters used in the BCD method, D_star and lambda_1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIdentApproximate spectral type (ident)src.spTypecharLstarlog of the stellar luminosity (L_star)log(solLum)phys.luminosityfloatMstarStellar mass (M_star)solMassphys.massfloatRpolePolar radius (R_pole)phys.angSize;srcfloatTeffStellar effective temperature (T_eff)Kphys.temperature.effectiveintloggpolelog of polar gravity (logg_pole)log(cm.s**-2)phys.gravityfloatomegaCritical fraction in linear velocity (omega)(1)phys.veloc;arith.difffloatvsiniStellar projected rotational velocity (vsini)km/sphys.veloc.rotatintDstarBCD parameter D_star (D_star)phys.angSizefloatlambda1BCD parameter lambda_1 (lambda1)0.1nmstat.paramfloatrespowSpectral resolving power for which the BCD parameters were measured (respow)spect.resolutionint