J/MNRAS/454/1468ivo://CDS.VizieR/J/MNRAS/454/1468doi:10.26093/cds/vizier.74541468CDSKamath D.Wood P.R.Van Winckel H.2024-08-15T20:15:44Z2015-10-16T11:03:29ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsyoung-stellar-objectshorizontal-branch-starsplanetary-nebulaephotometryradial-velocityWe have carried out a search for optically visible post-Asymptotic Giant Branch (post- AGB) stars in the Large Magellanic Cloud (LMC). First, we selected candidates with a mid-IR excess and then obtained their optical spectra. We disentangled contaminants with unique spectra such as M-stars, C-stars, planetary nebulae, quasi-stellar objects and background galaxies. Subsequently, we performed a detailed spectroscopic analysis of the remaining candidates to estimate their stellar parameters such as effective temperature, surface gravity (logg), metallicity ([Fe/H]), reddening and their luminosities. This resulted in a sample of 35 likely post-AGB candidates with late-G to late-A spectral types, low logg, and [Fe/H]<-0.5. Furthermore, our study con- firmed the existence of the dusty post-Red Giant Branch (post-RGB) stars, discovered previously in our SMC survey, by revealing 119 such objects in the LMC. These objects have mid-IR excesses and stellar parameters (Teff, logg, [Fe/H]) similar to those of post-AGB stars except that their luminosities (<2500L_{sun}_), and hence masses and radii, are lower. These post-RGB stars are likely to be products of binary interaction on the RGB. The post-AGB and post-RGB objects show SED properties similar to the Galactic post-AGB stars, where some have a surrounding circumstellar shell, while some others have a surrounding stable disc similar to the Galactic post-AGB binaries. This study also resulted in a new sample of 162 young stellar objects, identified based on a robust logg criterion. Other interesting outcomes include objects with an UV continuum and an emission line spectrum; luminous supergiants; hot main-sequence stars; and 15 B[e] star candidates, 12 of which are newly discovered in this study.2015MNRAS.454.1468Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/1468CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)II/236 : UBVR CCD survey of the Magellanic clouds (Massey+, 2002)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/AJ/128/1606 : Magellanic Clouds Photometric Survey: the LMC (Zaritsky+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/1468https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/1468http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/1468https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/1468https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/1468http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/1468GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/454/1468/table2 (*Photometric data for the 2102 unique candidates for which spectra were obtained)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/454/1468/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/454/1468/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/454/1468/table2?GETtext/xml+votable180.050000true69.07395806-69.506111110.0055555555555555564/2068 5/8262-8263 8268-8269 8280-8281 6/33043 33046-33047 33081 33084 33104 33106 33112 33128-33129 331321.2415266230347566e-21 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/454/1468?format=asciiOpticaldefaultJ/MNRAS/454/1468/table2*Photometric data for the 2102 unique candidates for which spectra were obtainedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharprimaryRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainUmag? U magnitude (1)magphot.mag;em.opt.UfloatnullableBmag? B magnitude (1)magphot.mag;em.opt.BfloatnullableVmag? V magnitude (1)magphot.mag;em.opt.VfloatnullableRmag? R magnitude (1)magphot.mag;em.opt.RfloatnullableImag? I magnitude (1)magphot.mag;em.opt.IfloatnullableJmag? J magnitude (1)magphot.mag;em.IR.JfloatnullableHmag? H magnitude (1)magphot.mag;em.IR.HfloatnullableKmag? K magnitude (1)magphot.mag;em.IR.KfloatnullableW1mag? WISE W1 magnitude (3)magphot.mag;em.IR.3-4umfloatnullable[3.6]mag? IRAC 3.6um magnitude (2)magphot.mag;em.IR.3-4umfloatnullable[4.5]mag? IRAC 4.5um magnitude (2)magphot.mag;em.IR.4-8umfloatnullableW2mag? WISE W2 magnitude (3)magphot.mag;em.IR.4-8umfloatnullable[5.8]? IRAC 5.8um magnitude (2)magphot.flux.density;em.IR.4-8umfloatnullable[8.0]? IRAC 8.0um magnitude (2)magphot.flux.density;em.IR.8-15umfloatnullableW3mag? WISE W4 magnitude (3)magphot.flux.density;em.IR.8-15umfloatnullableW4mag? WISE W3 magnitude (3)magphot.flux.density;em.IR.15-30umfloatnullable[24]? MIPS 24um magnitude (2)magphot.flux.density;em.IR.15-30umfloatnullable[70]? MIPS 70um magnitude (2)magphot.flux.density;em.IR.30-60umfloatnullable[160]? MIPS 160um magnitude (2)magphot.flux.density;em.mm.1500-3000GHzfloatnullableLobsObserved luminosity (4)solLumphys.luminosityintTeffPhotometric temperature, T_eff,sed_ (5)Kphys.temperature.effectiveintMoreindicates informations on other tablesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/MNRAS/454/1468/table4The observational and stellar parameters for the post-AGB candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCase[AB] A: Candidates with [Fe/H] estimates from spectra, B: Candidates with [Fe/H]=-0.50meta.codecharsedShow the SEDmeta.ref.urlcharplotShow spectral typing resultmeta.ref.urlcharNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_Name[abc+pd] Note on Name (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.ZfloatE(B-V)B-V colour indexmagphot.color.excessfloatLobsObservation luminosity corrected for foreground extinctionsolLumphys.luminosityintLphPhotospheric luminosity of the central starsolLumphys.luminosityintVmagOptical V-band magnitudemagphot.mag;em.optfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricinte_RVrms uncertainty on RVkm/sstat.errorintMass? Derived mass of the post-AGB candidate (not for table6)solMassphys.massfloatnullableSEDSED type of the object (not for table6)src.classcharHa[a,e -] Nature of the H{alpha} line at 6562.8{AA} (2)meta.codecharFWHM? Full width at half maximum of the H{alpha} linekm/sspect.line.widthfloatnullable[OIII][a,e- ] Nature of the [OIII] at 5001{AA} (2)meta.codecharComPrevious identifications (G1)meta.notecharJ/MNRAS/454/1468/table5The observational and stellar parameters for the post-RGB candidatesRVRadial velocitykm/sphys.veloc;pos.heliocentricintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCase[AB] A: Candidates with [Fe/H] estimates from spectra, B: Candidates with [Fe/H]=-0.50meta.codecharsedShow the SEDmeta.ref.urlcharplotShow spectral typing resultmeta.ref.urlcharNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_Name[abc+pd] Note on Name (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.ZfloatE(B-V)B-V colour indexmagphot.color.excessfloatLobsObservation luminosity corrected for foreground extinctionsolLumphys.luminosityintLphPhotospheric luminosity of the central starsolLumphys.luminosityintVmagOptical V-band magnitudemagphot.mag;em.optfloate_RVrms uncertainty on RVkm/sstat.errorintMass? Derived mass of the post-AGB candidate (not for table6)solMassphys.massfloatnullableSEDSED type of the object (not for table6)src.classcharHa[a,e -] Nature of the H{alpha} line at 6562.8{AA} (2)meta.codecharFWHM? Full width at half maximum of the H{alpha} linekm/sspect.line.widthfloatnullable[OIII][a,e- ] Nature of the [OIII] at 5001{AA} (2)meta.codecharComPrevious identifications (G1)meta.notecharJ/MNRAS/454/1468/table6The observational and stellar parameters for the YSO candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCase[AB] A: Candidates with [Fe/H] estimates from spectra, B: Candidates with [Fe/H]=-0.50meta.codecharsedShow the SEDmeta.ref.urlcharplotShow spectral typing resultmeta.ref.urlcharNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharn_Name[abc+pd] Note on Name (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicityphys.abund.ZfloatE(B-V)B-V colour indexmagphot.color.excessfloatLobsObservation luminosity corrected for foreground extinctionsolLumphys.luminosityintLphPhotospheric luminosity of the central starsolLumphys.luminosityintVmagOptical V-band magnitudemagphot.mag;em.optfloatRVRadial velocitykm/sphys.veloc;pos.heliocentricinte_RVrms uncertainty on RVkm/sstat.errorintMass? Derived mass of the post-AGB candidate (not for table6)solMassphys.massfloatnullableSEDSED type of the object (not for table6)src.classcharHa[a,e -] Nature of the H{alpha} line at 6562.8{AA} (2)meta.codecharFWHM? Full width at half maximum of the H{alpha} linekm/sspect.line.widthfloatnullable[OIII][a,e- ] Nature of the [OIII] at 5001{AA} (2)meta.codecharComPrevious identifications (G1)meta.notecharJ/MNRAS/454/1468/tablea1C-stars in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharJ/MNRAS/454/1468/tablea2M-stars in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharJ/MNRAS/454/1468/tablea3The new planetary nebula candidates and previously known planetary nebulae in our samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCode[UP] Uncatalogued or Previously identified planetary nebulaemeta.codecharNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharComPrevious Identification (G1)meta.notecharJ/MNRAS/454/1468/tableb1The observational and stellar parameters for the 85 objects without B and V magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCase[AB] A: Candidates with [Fe/H] estimates from spectra, B: Candidates with [Fe/H]=-0.50meta.codecharNameName (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharTeffEffective temperature, estimated using the STPKphys.temperature.effectiveintloggSurface gravity, estimated using the STPlog(cm.s**-2)phys.gravityfloat[Fe/H]Metallicity, estimated using the STPphys.abund.ZfloatVmag? Optical V-band magnitudemagphot.mag;em.optfloatnullableLobsObservation luminosity corrected for foreground extinctionsolLumphys.luminosityintHRVEstimated heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_HRVrms uncertainty on HRVkm/sstat.errorintJ/MNRAS/454/1468/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar