J/MNRAS/505/5567ivo://CDS.VizieR/J/MNRAS/505/5567doi:10.26093/cds/vizier.75055567CDSVieira K.Garcia-Varela A.Sabogal B.Rimulo L.R.Hernandez J.2024-11-06T20:34:06Z2024-06-24T12:43:53ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsb-starsinfrared-astronomymillimeter-astronomyphotometrysubmillimeter-astronomyvisible-astronomytrigonometric-parallaxproper-motionsWe revisit the subject of Be candidate stars towards the Magellanic Clouds, previously studied by the authors using SPM4 proper motions. We obtain Gaia DR2 parallaxes and proper motions for 2357 and 994 LMC and SMC Be candidates, respectively. Parallaxes and proper motions versus colour V - I easily reveal the presence of the redder galactic contaminant foreground, as concluded in our previous work, but this time we do find a few red Be candidates consistent with being true Magellanic objects. A membership assessment to each Magellanic Cloud is done for each Be candidate, based on the distribution of their parallaxes and proper motions. From a compilation of published catalogues of spectroscopically confirmed emission line stars,we find that 41 (LMC) and 56 (SMC) of the Be candidates have shown the H{alpha} line in emission. Near-infrared IRSF JHKs magnitudes are obtained for about 70 per cent of the Be candidates with Gaia DR2 astrometric data. Mid-infrared SAGE IRAC 3.6, 4.5, 5.8, and 8.0 {mu}m magnitudes are obtained for about 85 per cent as well. After discarding possible Herbig Ae/Be stars, one LMC and three SMC B emission line confirmed stars show significantly redder optical, near and mid-infrared colours than what has been typically measured for Classical Be stars - they are called red Be stars. Taking into account that classical Be stars do not show these red colours, further studies about these four stars are needed in order to establish their true nature and explain the observed red excess.2021MNRAS.505.5567Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/505/5567CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/361/1055 : BVI photometry of LMC Be stars (Sabogal+, 2005)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/305 : SAGE LMC and SMC IRAC Source Catalog (IPAC 2009)II/288 : IRSF Magellanic Clouds Point Source Catalog (Kato+ 2007)J/A+A/462/683 : Velocities in SMC field of NGC 330 (Martayan+, 2007)J/A+A/509/A11 : H{alpha} emission-line objects in SMC clustersJ/MNRAS/421/3622 : Candidate Be stars in the Magellanic Clouds (Paul+, 2012)J/ApJ/771/111 : SMC dusty OB stars. I. Optical spectroscopy (Sheets+, 2013)J/MNRAS/425/355 : Hot stars in LMC UKST H{alpha} survey (Reid+, 2012)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/505/5567https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/505/5567http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/505/5567https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/505/5567https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/505/5567http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/505/5567GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/505/5567/tablea1 (the LMC Be stars data used in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/505/5567/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/505/5567/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/505/5567/tablea1?GETtext/xml+votable180.050000true76.79218055039-69.181585502470.005555555555555556Cone search capability for table J/MNRAS/505/5567/tablea2 (the four exceptionally red Be stars, ID = 909 is in the LMC and ID = 75, 184, and 547 are in the SMC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/505/5567/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/505/5567/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/505/5567/tablea2?GETtext/xml+votable180.050000true79.16335801642-69.346668214980.005555555555555556Cone search capability for table J/MNRAS/505/5567/tablea3 (the SMC Be stars data used in this study)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/505/5567/tablea3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/505/5567/tablea3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/505/5567/tablea3?GETtext/xml+votable180.050000true9.84198062743-73.425537423550.0055555555555555565/8274 6/33053 33055 33077 33089-33091 33120-33121 33294-33295 33304 33306 33316-33317 333282.0616683193919197e-20 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/505/5567?format=asciiOpticalInfraredMillimeterdefaultJ/MNRAS/505/5567/tablea1the LMC Be stars data used in this study_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier number index from this work (idBe)meta.idintOGLEDesignation HHMMSSss-DDMMSSs (J2000) (OGLE) (G1)meta.id;meta.maincharVmagApparent magnitude in V band (Vmag) (G1)magphot.mag;em.opt.VfloatB-VB-V colour index (B-V) (G1)magphot.color;em.opt.B;em.opt.VfloatV-IV-I colour index (V-I) (G1)magphot.color;em.opt.V;em.opt.IfloatType[1/4] Type of the star (Type_num) (G2)src.classfloatGaiaDR2Gaia DR2 source identifier (GaiaDR2_source_id) (G3)meta.idRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra) (G3)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec) (G3)degpos.eq.dec;meta.mainplx? Absolute stellar parallax (parallax) (G3)maspos.parallax.trigfloatnullablee_plx? Mean error of plx (parallax_error) (G3)masstat.error;pos.parallaxfloatnullablepmRA? Proper motion in right ascension direction pmRA*cosDE (pmra) (G3)mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Mean error of pmRA (pmra_error) (G3)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declination direction (pmdec) (G3)mas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Mean error of pmDE (pmdec_error) (G3)mas/yrstat.error;pos.pm;pos.eq.decfloatnullableGmagG-band mean magnitude (Vega) (phot_g_mean_mag) (G3)magphot.mag;em.optdoubleBPmag? Integrated BP mean magnitude (Vega) (phot_bp_mean_mag) (G3)magphot.mag;em.opt.BdoublenullableRPmag? Integrated RP mean magnitude (Vega) (phot_rp_mean_mag) (G3)magphot.mag;em.opt.RdoublenullableRankPosition mag ranking value (rank) (G4)meta.codedoubleChi? {Chi}-value for membership to the Clouds ({Chi}) (G5)stat.fit.chi2doublenullableONamesBEL crossmatch confirmed with linked catalogues (other_names) (G6)meta.idcharJmag? Apparent magnitude in J band (Jmag) (G7)magphot.mag;em.IR.JfloatnullableHmag? Apparent magnitude in H band (Hmag) (G7)magphot.mag;em.IR.HfloatnullableKsmag? Apparent magnitude in Ks band (Ksmag) (G7)magphot.mag;em.IR.Kfloatnullable3.6mag? Apparent magnitude Spitzer/IRAC at 3.6 micron band magnitude ([3.6]) (G8)magphot.mag;em.IR.3-4umfloatnullable4.5mag? Apparent magnitude Spitzer/IRAC at 4.5 micron band magnitude ([4.5]) (G8)magphot.mag;em.IR.4-8umfloatnullable5.8mag? Apparent magnitude Spitzer/IRAC at 5.8 micron band magnitude ([5.8]) (G8)magphot.flux.density;em.IR.4-8umfloatnullable8.0mag? Apparent magnitude Spitzer/IRAC at 8.0 micron band magnitude ([8.0]) (G8)magphot.flux.density;em.IR.8-15umfloatnullableJ/MNRAS/505/5567/tablea2the four exceptionally red Be stars, ID = 909 is in the LMC and ID = 75, 184, and 547 are in the SMC_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decindexedV-IV-I colour index (V-I) (G1)magphot.color;em.opt.V;em.opt.IfloatType[1/4] Type of the star (Type_num) (G2)src.classfloatGaiaDR2Gaia DR2 source identifier (GaiaDR2_source_id) (G3)meta.idRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra) (G3)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec) (G3)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier number index from this work (idBe)meta.idintOGLEDesignation HHMMSSss-DDMMSSs (J2000) (OGLE) (G1)meta.id;meta.maincharVmagApparent magnitude in V band (Vmag) (G1)magphot.mag;em.opt.VfloatB-VB-V colour index (B-V) (G1)magphot.color;em.opt.B;em.opt.VfloatplxAbsolute stellar parallax (parallax) (G3)maspos.parallax.trigfloate_plxMean error of plx (parallax_error) (G3)masstat.error;pos.parallaxfloatpmRAProper motion in right ascension direction pmRA*cosDE (pmra) (G3)mas/yrpos.pm;pos.eq.rafloate_pmRAMean error of pmRA (pmra_error) (G3)mas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declination direction (pmdec) (G3)mas/yrpos.pm;pos.eq.decfloate_pmDEMean error of pmDE (pmdec_error) (G3)mas/yrstat.error;pos.pm;pos.eq.decfloatGmagG-band mean magnitude (Vega) (phot_g_mean_mag) (G3)magphot.mag;em.optdoubleBPmagIntegrated BP mean magnitude (Vega) (phot_bp_mean_mag) (G3)magphot.mag;em.opt.BdoubleRPmagIntegrated RP mean magnitude (Vega) (phot_rp_mean_mag) (G3)magphot.mag;em.opt.RdoubleRankPosition mag ranking value (rank) (G4)meta.codedoubleChi{Chi}-value for membership to the Clouds ({Chi}) (G5)stat.fit.chi2doubleONamesBEL crossmatch confirmed with linked catalogues (other_names) (G6)meta.idcharJmagApparent magnitude in J band (Jmag) (G7)magphot.mag;em.IR.JfloatHmagApparent magnitude in H band (Hmag) (G7)magphot.mag;em.IR.HfloatKsmagApparent magnitude in Ks band (Ksmag) (G7)magphot.mag;em.IR.Kfloat3.6magApparent magnitude Spitzer/IRAC at 3.6 micron band magnitude ([3.6]) (G8)magphot.mag;em.IR.3-4umfloat4.5magApparent magnitude Spitzer/IRAC at 4.5 micron band magnitude ([4.5]) (G8)magphot.mag;em.IR.4-8umfloat5.8magApparent magnitude Spitzer/IRAC at 5.8 micron band magnitude ([5.8]) (G8)magphot.flux.density;em.IR.4-8umfloat8.0magApparent magnitude Spitzer/IRAC at 8.0 micron band magnitude ([8.0]) (G8)magphot.flux.density;em.IR.8-15umfloatJ/MNRAS/505/5567/tablea3the SMC Be stars data used in this study_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decindexedpmRA? Proper motion in right ascension direction pmRA*cosDE (pmra) (G3)mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA? Mean error of pmRA (pmra_error) (G3)mas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Proper motion in declination direction (pmdec) (G3)mas/yrpos.pm;pos.eq.decfloatnullableRankPosition mag ranking value (rank) (G4)meta.codedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier number index from this work (idBe)meta.idintOGLEDesignation HHMMSSss-DDMMSSs (J2000) (OGLE) (G1)meta.id;meta.maincharVmagApparent magnitude in V band (Vmag) (G1)magphot.mag;em.opt.VfloatB-VB-V colour index (B-V) (G1)magphot.color;em.opt.B;em.opt.VfloatV-IV-I colour index (V-I) (G1)magphot.color;em.opt.V;em.opt.IfloatType[1/4] Type of the star (Type_num) (G2)src.classfloatGaiaDR2Gaia DR2 source identifier (GaiaDR2_source_id) (G3)meta.idRA_ICRSBarycentric right ascension (ICRS) at Ep=2015.5 (ra) (G3)degpos.eq.ra;meta.mainDE_ICRSBarycentric declination (ICRS) at Ep=2015.5 (dec) (G3)degpos.eq.dec;meta.mainplx? Absolute stellar parallax (parallax) (G3)maspos.parallax.trigfloatnullablee_plx? Mean error of plx (parallax_error) (G3)masstat.error;pos.parallaxfloatnullablee_pmDE? Mean error of pmDE (pmdec_error) (G3)mas/yrstat.error;pos.pm;pos.eq.decfloatnullableGmagG-band mean magnitude (Vega) (phot_g_mean_mag) (G3)magphot.mag;em.optdoubleBPmag? Integrated BP mean magnitude (Vega) (phot_bp_mean_mag) (G3)magphot.mag;em.opt.BdoublenullableRPmag? Integrated RP mean magnitude (Vega) (phot_rp_mean_mag) (G3)magphot.mag;em.opt.RdoublenullableChi? {Chi}-value for membership to the Clouds ({Chi}) (G5)stat.fit.chi2doublenullableONamesBEL crossmatch confirmed with linked catalogues (other_names) (G6)meta.idcharJmag? Apparent magnitude in J band (Jmag) (G7)magphot.mag;em.IR.JfloatnullableHmag? Apparent magnitude in H band (Hmag) (G7)magphot.mag;em.IR.HfloatnullableKsmag? Apparent magnitude in Ks band (Ksmag) (G7)magphot.mag;em.IR.Kfloatnullable3.6mag? Apparent magnitude Spitzer/IRAC at 3.6 micron band magnitude ([3.6]) (G8)magphot.mag;em.IR.3-4umfloatnullable4.5mag? Apparent magnitude Spitzer/IRAC at 4.5 micron band magnitude ([4.5]) (G8)magphot.mag;em.IR.4-8umfloatnullable5.8mag? Apparent magnitude Spitzer/IRAC at 5.8 micron band magnitude ([5.8]) (G8)magphot.flux.density;em.IR.4-8umfloatnullable8.0mag? Apparent magnitude Spitzer/IRAC at 8.0 micron band magnitude ([8.0]) (G8)magphot.flux.density;em.IR.8-15umfloatnullable