J/ApJ/348/98ivo://CDS.VizieR/J/ApJ/348/98doi:10.26093/cds/vizier.13480098CDSReid N.Tinney C.Mould J.2013-01-09T13:05:08Z2009-10-30T06:20:16ZCDS support team

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

cds-question@unistra.frmagellanic-cloudsgiant-starsinfrared-sourcesWe present the results of a search for optically obscured asymptotic giant branch (AGB) stars in the Large Magellanic Cloud (LMC), combining data obtained using the IRAS satellite with near-infrared photographic plate material of a 15deg^2^ region in the northern LMC. Of the 156 IRAS sources that are detected either in separate cross-scans or in more than one passband, 63 have [12-25] colors consistent with their being either stellar photospheres or circumstellar dust shells. Seventeen of these we identify with bright (I_c_<9) foreground stars in our own Galaxy, while a further 17 are associated with red supergiants in the LMC. Of the remaining stars, no more than five are likely to be optically visible AGB stars, while the rest have no obvious optical counterpart. This immediately rules out the presence of sufficient high-luminosity "cocoon" stars to explain the observed deficit of several hundred luminous (M_bol_<-6) AGB stars between the predictions of standard models of AGB evolution and the observed luminosity function. It remains possible that most of the unidentified sources are dusty AGB stars, evolving through a phase of enhanced mass loss toward becoming planetary nebulae. We infer bolometric magnitudes as low as M_bol_~-5 for these sources and suggest that this phase can be triggered at low luminosities, truncating AGB evolution and leading to the observed scarcity of asymptotic giant branch stars with bolometric magnitudes brighter than -6.0mag.1990ApJ...348...98Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/348/98CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/348/98https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/348/98http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/348/98https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/348/98https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/348/98http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/348/98GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/348/98/table3 (TRM selected sources in LMC north)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/348/98/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/348/98/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/348/98/table3?GETtext/xml+votable180.050000true80.903339-67.8793710.0055555555555555565/8278 6/33101 33102 33103 33106 33107 33110 33116 33121 33124 33125 33136 33137https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/348/98?format=asciiInfrareddefaultJ/ApJ/348/98/table3TRM selected sources in LMC northrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTRMTRM designation (1)meta.id;meta.mainintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainScan[1/3] Information on the scan directions (2)obs.paramintS12? Flux density at 12 {mu}m (3)Jyphot.flux.density;em.IR.8-15umfloatnullableS25? Flux density at 25 {mu}m (3)Jyphot.flux.density;em.IR.15-30umfloatnullableS60? Flux density at 60 {mu}m (3)Jyphot.flux.density;em.IR.30-60umfloatnullableS100? Flux density at 100 {mu}m (3)Jyphot.flux.density;em.IR.60-100umfloatnullablePSC[*] PSC association, see note (4)meta.notecharRej[YN] Rejection (Y: yes, N: no)meta.notecharComComments on rejection (6)meta.notechar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed