J/A+A/641/A142ivo://CDS.VizieR/J/A+A/641/A142doi:10.26093/cds/vizier.36410142CDSSzczerba R.Hajduk M.PavlenkoYa.V.Hrivnak B.J.KaminskyB.M.,Volk K.Siodmiak N. Gezer I.Zacs L.Pych W.Sarna M.2021-09-08T06:42:03Z2020-09-23T08:32:19ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgiant-starsspectroscopyWe selected a sample of post-AGB candidates in the Magellanic Clouds on the basis of their near- and mid-infrared colour characteristics. Fifteen of the most optically bright post-AGB candidates were observed with the South African Large Telescope in order to determine their stellar parameters and thus to validate or discriminate their nature as post-AGB objects in the Magellanic Clouds. The spectral types of absorption-line objects were estimated according to the MK classification, and effective temperatures were obtained by means of stellar atmosphere modelling. Emission-line objects were classified on the basis of the fluxes of the emission lines and the presence of the continuum. Out of 15 observed objects, only 4 appear to be genuine post-AGB stars (27%). In the SMC, 1 out of 4 is post-AGB, and in the LMC, 3 out 11 are post-AGB objects. Thus, we can conclude that the selected region in the colour-colour diagram, while selecting the genuine post-AGB objects, overlaps severely with other types of objects, in particular young stellar objects and planetary nebulae. Additional classification criteria are required to distinguish between post-AGB stars and other types of objects. In particular, photometry at far-IR wavelengths would greatly assist in distinguishing young stellar objects from evolved ones. On the other hand, we showed that the low-resolution optical spectra appear to be sufficient to determine whether the candidates are post-AGB objects.2020A&A...641A.142Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/641/A142CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/641/A142https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/641/A142http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/641/A142https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/641/A142https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/641/A142http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/641/A142GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/641/A142/table1 (Designations and positions for the standard star and post-AGB candidates in the Magellanic Clouds)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/641/A142/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/641/A142/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/641/A142/table1?GETtext/xml+votable180.050000true15.67933806-72.123913060.0055555555555555566/33053 33090 33093-33094 33098 33101 33125-33127 33295 33304 33328https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/641/A142?format=asciidefaultJ/A+A/641/A142/table1Designations and positions for the standard star and post-AGB candidates in the Magellanic CloudsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNo[0/15] Identification numbermeta.idintSAGESAGE name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSNameShort namemeta.idchar2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.idcharIRASIRAS namemeta.idcharONameOther namemeta.idcharRAJ2000Right ascension (J2000) (G1)degpos.eq.ra;meta.mainDEJ2000Declination (J2000) (G1)degpos.eq.dec;meta.mainsp1Show the spectrummeta.ref.urlcharFileName1Name of the file with spectrummeta.id;meta.filecharsp2Show the spectrummeta.ref.urlcharFileName2Name of the second file with spectrummeta.id;meta.filecharJ/A+A/641/A142/fig2Red spectra of the objects showing emission lines or emission and absorption linesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1Wavelength for J004747 flux (1)0.1nmem.wldoubleRFlux1Relative flux for J004747 (G1)phot.flux;arith.ratiodoublelambda2Wavelength for J004841 flux (1)0.1nmem.wldoubleRFlux2Relative flux for J004841 (G1)phot.flux;arith.ratiodoublelambda4Wavelength for J011542 flux (1)0.1nmem.wldoubleRFlux4Relative flux for J011542 (G1)phot.flux;arith.ratiodoublelambda5Wavelength for J045747 flux (1)0.1nmem.wldoubleRFlux5Relative flux for J045747 (G1)phot.flux;arith.ratiodoublelambda6Wavelength for J045907 flux (1)0.1nmem.wldoubleRFlux6Relative flux for J045907 (G1)phot.flux;arith.ratiodoublelambda8Wavelength for J051228 flux (1)0.1nmem.wldoubleRFlux8Relative flux for J051228 (G1)phot.flux;arith.ratiodoublelambda10Wavelength for J052229 flux (1)0.1nmem.wldoubleRFlux10Relative flux for J052229 (G1)phot.flux;arith.ratiodoublelambda12Wavelength for J052915a flux (1)0.1nmem.wldoubleRFlux12Relative flux for J052915a (G1)phot.flux;arith.ratiodoublelambda13Wavelength for J053348 flux (1)0.1nmem.wldoubleRFlux13Relative flux for J053348 (G1)phot.flux;arith.ratiodoublelambda14Wavelength for J054055 flux (1)0.1nmem.wldoubleRFlux14Relative flux for J054055 (G1)phot.flux;arith.ratiodoublelambda15Wavelength for J055825 flux (1)0.1nmem.wldoubleRFlux15Relative flux for J055825 (G1)phot.flux;arith.ratiodoubleJ/A+A/641/A142/fig3Spectra of the absorption line or featureless objects in the red settinglambda9Wavelength for J052043 flux (1)0.1nmem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda0Wavelength for Sk 105 flux (1)0.1nmem.wldoubleRFlux0Relative flux for Sk 105 (G1)phot.flux;arith.ratiodoublelambda11Wavelength for J052520 flux (1)0.1nmem.wldoubleRFlux11Relative flux for J052520 (G1)phot.flux;arith.ratiodoubleRFlux9Relative flux for J052043 (G1)phot.flux;arith.ratiodoublelambda7Wavelength for J051110 flux (1)0.1nmem.wldoubleRFlux7Relative flux for J051110 (G1)phot.flux;arith.ratiodoublelambda3Wavelength for J010546 flux (1)0.1nmem.wldoubleRFlux3Relative flux for J010546 (G1)phot.flux;arith.ratiodoubleJ/A+A/641/A142/fig4Spectra of objects in the blue settingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda11Wavelength for J052520 (1)0.1nmem.wldoubleRFlux11Relative flux for JJ052520 (G1)phot.flux;arith.ratiodoublelambda15Wavelength for J055825 (1)0.1nmem.wldoubleRFlux15Relative flux for J055825 (G1)phot.flux;arith.ratiodouble