J/MNRAS/469/4175ivo://CDS.VizieR/J/MNRAS/469/4175doi:10.26093/cds/vizier.74694175CDSVieira K.Garcia-Varela A.Sabogal B.2024-08-17T20:19:32Z2020-06-02T11:36:15ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsbe-starsproper-motionsradial-velocityWe present a proper motion investigation of a sample of Be star candidates towards the Magellanic Clouds, which has resulted in the identification of separate populations, in the Galactic foreground and in the Magellanic background. Be stars are broadly speaking B-type stars that have shown emission lines in their spectra. In this work, we studied a sample of 2446 and 1019 Be star candidates towards the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC), respectively, taken from the literature and proposed as possible Be stars due to their variability behaviour in the OGLE-II I band. JHKs magnitudes from the InfraRed Survey Facility catalogue and proper motions from the Southern Proper Motion 4 catalogue were obtained for 1188 and 619 LMC and SMC Be stars candidates, respectively. Colour-colour and vector-point diagrams were used to identify different populations amongst the Be star candidates. In the LMC sample, two populations with distinctive infrared colours and kinematics were found, the bluer sample is consistent with being in the LMC and the redder one with belonging to the Milky Way disc. This settles the nature of the redder sample that had been described in previous publications as a possible unknown subclass of stars amongst the Be candidates in the LMC. In the SMC sample, a similar but less evident result was obtained, since this apparent unknown subclass was not seen in this galaxy. We confirm that in the selection of Be stars by their variability, although generally successful, there is a higher risk of contamination by Milky Way objects towards redder B-V and V-I colours.2017MNRAS.469.4175Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/469/4175CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/320 : SPM 4.0 Catalog (Girard+, 2011)J/AcA/48/147 : OGLE SMC BVI photometry (Udalski+, 1998)J/AcA/50/307 : OGLE LMC BVI photometry (Udalski+, 2000)J/A+A/393/887 : SMC Be stars candidates (Mennickent+, 2002)J/MNRAS/361/1055 : BVI photometry of LMC Be stars (Sabogal+, 2005)J/MNRAS/421/3622 : Candidate Be stars in the Magellanic Clouds (Paul+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/469/4175https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/469/4175http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/469/4175https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/469/4175https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/469/4175http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/469/4175GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/469/4175/lmc-pm (Be stars candidates in the LMC, that includes OGLE-II BVI and IRSF JHKs photometry and SPM4 proper motions for each star (table A1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/4175/lmc-pm?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/4175/lmc-pm?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/4175/lmc-pm?GETtext/xml+votable180.050000true81.6505226-69.53350140.005555555555555556Cone search capability for table J/MNRAS/469/4175/smc-pm (Be stars candidates in the SMC, that includes OGLE-II BVI and IRSF JHKs photometry and SPM4 proper motions for each star (table A1))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/4175/smc-pm?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/4175/smc-pm?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/4175/smc-pm?GETtext/xml+votable180.050000true9.0747302-73.7131910.0055555555555555565/8274 6/33053 33055 33077 33089-33091 33120-33121 33294-33295 33304 33306 33316-33317 333283.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/469/4175?format=asciidefaultJ/MNRAS/469/4175/lmc-pmBe stars candidates in the LMC, that includes OGLE-II BVI and IRSF JHKs photometry and SPM4 proper motions for each star (table A1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[*] * indicates full kinematic information in tables lmc-rv/smc-rvmeta.notecharNameOGLE_II_ID name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharVmagOGLE V magnitudemagphot.mag;em.opt.VfloatB-VOGLE B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-IOGLE V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatTypeType (1)src.classcharSPM4SPM4 identification numbermeta.idlongRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainpmRASPM4 Proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublepmDESPM4 Proper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatm[1/6] SPM4 Number of 1st-epoch plates usedmeta.numberintn[0/4] SPM4 Number of 2nd-epoch plates usedmeta.numberinti[0/9] SPM4 Number of 2nd-epoch CCD frames usedmeta.numberintJmagIRSF J magnitudemagphot.mag;em.IR.JfloatHmagIRSF H magnitudemagphot.mag;em.IR.HfloatKmagIRSF K magnitudemagphot.mag;em.IR.KfloatJ/MNRAS/469/4175/lmc-rvBe stars candidates in the LMC that have full kinematic information (table A2)V-IOGLE V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatSPM4SPM4 identification numbermeta.idlongrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOGLE_II_ID name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSpTypeSpectral typesrc.spTypecharRVRadial velocitykm/sphys.veloc;pos.heliocentricinte_RVrms uncertainty on RVkm/sstat.errorintpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatJ/MNRAS/469/4175/smc-pmBe stars candidates in the SMC, that includes OGLE-II BVI and IRSF JHKs photometry and SPM4 proper motions for each star (table A1)VmagOGLE V magnitudemagphot.mag;em.opt.VfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[*] * indicates full kinematic information in tables lmc-rv/smc-rvmeta.notecharNameOGLE_II_ID name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharB-VOGLE B-V colour indexmagphot.color;em.opt.B;em.opt.VfloatV-IOGLE V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatTypeType (1)src.classcharSPM4SPM4 identification numbermeta.idlongRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainpmRASPM4 Proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublepmDESPM4 Proper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatm[1/6] SPM4 Number of 1st-epoch plates usedmeta.numberintn[0/4] SPM4 Number of 2nd-epoch plates usedmeta.numberinti[0/9] SPM4 Number of 2nd-epoch CCD frames usedmeta.numberintJmagIRSF J magnitudemagphot.mag;em.IR.JfloatHmagIRSF H magnitudemagphot.mag;em.IR.HfloatKmagIRSF K magnitudemagphot.mag;em.IR.KfloatJ/MNRAS/469/4175/smc-rvBe stars candidates in the SMC that have full kinematic information (table A3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOGLE_II_ID name (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSpTypeSpectral typesrc.spTypecharRVRadial velocitykm/sphys.veloc;pos.heliocentricinte_RVrms uncertainty on RVkm/sstat.errorintV-IOGLE V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatSPM4SPM4 identification numbermeta.idlongpmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloat