J/MNRAS/540/3523ivo://CDS.VizieR/J/MNRAS/540/3523doi:10.26093/cds/vizier/bg-gw-3e3CDSBestenlehner J.M.Crowther P.A.Bronner V.A.Simon-Diaz S.Lennon D.J.,Bodensteiner J.Langer N.Marchant P.Sana H.Schneider F.R.N.,Shenar T.2026-08-03T07:33:24Z2025-12-04T08:34:19ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsob-starsradial-velocityvisible-astronomyWe aim to determine the physical properties of OB stars from the multi-epoch Binarity at LOw Metallicity (BLOeM) spectroscopic survey of the Small Magellanic Cloud using the Very Large Telescope/Fibre Large Array Multi-Element Spectrograph. We apply a pipeline designed to analyse large spectroscopic samples of OB stars to the co-added, initial nine epochs of the BLOeM survey, utilizing grids of synthetic model spectra computed with the stellar atmosphere code fastwind. 69 OB stars are excluded from the analysis owing to disc emission or significant contamination by secondaries in SB2 binaries. We determine physical properties of 778 OB stars, including Teff, logg, logL_{sun}_, and v_e_*sini. There appears to be a bimodality in v_e_*sini of single O stars, while v_e_*sini distributions of OB stars are strikingly different for single (median 78km/s) and binary (median 200km/s) systems. Inferred temperatures are broadly in agreement with literature results for stars in common, plus results from a grid-based automization tool for a subset of O and early B stars, although uncertainties are larger for surface gravities. Rotational velocities are broadly in line with an independent tool applied to the same subset. We recover the anticipated lower mass cut-off at 8M}_{sun}_ from the survey design using a Bayesian inference method coupled with SMC metallicity evolutionary models, with median masses of 12.6M_{sun}_ (19.8M_{sun}_) for B-type (O-type) stars. Spectroscopic masses exceed evolutionary masses, albeit with large uncertainties in surface gravities. We also provide an updated catalogue of O stars in the SMC since half of the 159 BLOeM O stars are newly classified as O-type stars.2025MNRAS.540.3523Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/540/3523CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/690/A289 : Binarity at LOw Metallicity (BLOeM). I. (Shenar+, 2024)J/A+A/698/A38 : BLOeM. Oe and Be stars (Bodensteiner+, 2025)J/A+A/698/A39 : BLOeM. BAF-type supergiants (Patrick+, 2025)J/A+A/698/A40 : BLOeM. SMC early B supergiants multiplicityJ/A+A/698/A41 : BLOeM. Early B dwarfs and giants at Z=0.2 (Villasenor+, 2025)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/540/3523https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/540/3523http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/540/3523https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/540/3523https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/540/3523http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/540/3523GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/540/3523/tablea1 (Physical parameters of BLOeM OB stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/540/3523/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/540/3523/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/540/3523/tablea1?GETtext/xml+votable180.050000true15.19165525528-72.219161778630.005555555555555556Cone search capability for table J/MNRAS/540/3523/tableh1 (Updated catalogue of spectroscopically confirmed O stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/540/3523/tableh1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/540/3523/tableh1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/540/3523/tableh1?GETtext/xml+votable180.050000true6.944-73.27938890.0055555555555555565/8326 6/33293-33295 33297-33299 33315-33317 333281.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/540/3523?format=asciiOpticaldefaultJ/MNRAS/540/3523/tablea1Physical parameters of BLOeM OB starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBLOeMBLOeM identifier (N-NNN) (1)meta.id;meta.maincharSpTypeSpectral type (1)src.spTypecharRVRadial velocitykm/sphys.veloc;pos.heliocentricintNotesNotes (4)meta.notechars_RV? Radial velocity dispersionkm/sspect.dopplerVelocfloatnullableTeff? Effective temperaturekKphys.temperature.effectivefloatnullableE_Teff? Error on Teff (upper)kKstat.error;stat.maxfloatnullablee_Teff? Error on Teff (lower)kKstat.error;phys.temperature.effectivefloatnullablelogg? log surface gravitycm.s**-2phys.gravityfloatnullableE_logg? Error on logg (upper)cm.s**-2stat.error;stat.maxfloatnullablee_logg? Error on logg (lower)cm.s**-2stat.errorfloatnullableloggc? log surface gravity centrifugal correctedcm.s**-2phys.gravityfloatnullableE_loggc? Error on logg_c (upper)cm.s**-2stat.error;stat.maxfloatnullablee_loggc? Error on logg_c (lower)cm.s**-2stat.errorfloatnullableRstar? Stellar radiussolRadphys.size.radiusfloatnullableE_Rstar? Error on stellar radius (upper)solRadstat.error;stat.maxfloatnullablee_Rstar? Error on stellar radius (lower)solRadstat.errorfloatnullablelogL? Log stellar luminositylog(solLum)phys.luminosityfloatnullableE_logL? Error on logL (upper)log(solLum)stat.error;stat.maxfloatnullablee_logL? Error on logL (lower)log(solLum)stat.errorfloatnullableY? He abundance mass fractionphys.abund.YfloatnullableE_Y? Error on Y (upper)stat.error;stat.maxfloatnullablee_Y? Error on Y (lower)stat.error;pos.cartesian.yfloatnullablevsini? Projected radial velocitykm/sspect.dopplerVelocintnullableE_vsini? Error on vsini (upper)km/sstat.error;stat.maxintnullablee_vsini? Error on vsini (lower)km/sstat.error;phys.veloc.rotatintnullableMspec? Spectroscopic masssolMassphys.massfloatnullableE_Mspec? Error on Mspec (upper)solMassstat.error;stat.maxfloatnullablee_Mspec? Error on Mspec (lower)solMassstat.errorfloatnullableMevol? Evolutionary mass (2)solMassphys.massfloatnullableE_Mevol? Error on Mevol (upper)solMassstat.error;stat.maxfloatnullablee_Mevol? Error on Mevol (lower)solMassstat.errorfloatnullableAge? Stellar ageMyrtime.agefloatnullableE_Age? Error on age (upper)Myrstat.error;stat.maxfloatnullablee_Age? Error on age (lower)Myrstat.error;time.agefloatnullableKmag? K-band magnitude (3)magphot.mag;em.IR.KfloatnullableAV? Visual extinctionmagphys.absorptionfloatnullable_RAData from Shenar et al., 2024, Cat. J/A+A/690/A289 (right ascension part)degpos.eq.ra;meta.main_DEData from Shenar et al., 2024, Cat. J/A+A/690/A289 (declination part)degpos.eq.dec;meta.mainJ/MNRAS/540/3523/tableh1Updated catalogue of spectroscopically confirmed O starsM2002Massey (2002ApJS..141...81M, Cat. II/236) SMC identifiermeta.idcharCommentAlternative Spectral type/photometryspect.indexcharSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainGmagGaia G-band magnitude (1)magphot.mag;em.optfloatSpTypeLiterature spectral typesrc.spTypecharRefLiterature reference (2)meta.ref;pos.framecharNameName and Common alias (3)meta.id;meta.maincharBLOeMBLOeM identifier (4)meta.idcharJ/MNRAS/540/3523/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar