J/MNRAS/341/534ivo://CDS.VizieR/J/MNRAS/341/534doi:10.26093/cds/vizier.73410534CDSMorgan D.H.Cannon R.D.Hatzidimitriou D.Croke B.F.W.2024-06-28T20:17:15Z2006-03-10T23:18:37ZCDS support team

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

cds-question@unistra.frmagellanic-cloudscarbon-starsinfrared-photometryA sample of 1497 carbon stars in the Large Magellanic Cloud (LMC) has been observed in the red part of the spectrum with the 2dF facility on the Anglo-Australian Telescope. Of these, 156 have been identified as J-type (i.e. ^13^C-rich) carbon stars using a technique which provides a clear distinction between J stars and the normal N-type carbon stars that comprise the bulk of the sample, and yields few borderline cases. A simple two-dimensional classification of the spectra, based on their spectral slopes in different wavelength regions, has been constructed and found to be related to the more conventional c and j indices, modified to suit the spectral regions observed. Most of the J stars form a photometric sequence in the K-(J-K) colour-magnitude diagram, parallel to and 0.6mag fainter than the N-star sequence. A subset of the J stars (about 13 per cent) are brighter than this J-star sequence; most of these are spectroscopically different from the other J stars. The bright J stars have stronger CN bands than the other J stars and are found strongly concentrated in the central regions of the LMC. Most of the rather few stars in common with Hartwick and Cowley's sample (1988ApJ...334..135H) of suspected CH stars are J stars. Overall, the proportion of carbon stars identified as J stars is somewhat lower than has been found in the Galaxy. The Na D lines are weaker in the LMC J stars than in either the Galactic J stars or the LMC N stars, and do not seem to depend on temperature.2003MNRAS.341..534Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/341/534CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/2mass : The 2MASS database (IPAC/UMass, 2000)B/denis : The DENIS database (Epchtein+, 1999)J/A+A/369/932 : RI photometry of LMC carbon stars (Kontizas+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/341/534https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/341/534http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/341/534https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/341/534https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/341/534http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/341/534GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/341/534/table1 (J stars in the Large Magellanic Cloud)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/341/534/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/341/534/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/341/534/table1?GETtext/xml+votable180.050000true73.906875-70.04133330.0055555555555555565/8262-8263 8280 6/33027 33030-33031 33033 33036-33037 33043 33046-33047 33072-33073 33076-33077 33090 33098-33099 33101-33103 33114-33115 33118 33124-33125 33136-33137 33140 337978.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/341/534?format=asciiInfrareddefaultJ/MNRAS/341/534/table1J stars in the Large Magellanic CloudSimbadSimbad column added by the CDSchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainDENISDisplay the dat from DENIS Catalog (B/denis)charrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[KDM2001]KDM number, Kontizas et al., <J/A+A/369/932>intRcmag? Kron-Cousins R magnitude (from KDMK01)magfloatnullableIcmag? Kron-Cousins I magnitude (from KDMK01)magfloatnullableJmag? J magnitude (from 2MASS or DENIS)magfloatnullableHmag? H magnitude (from 2MASS) (0.00 indicates DENIS photometry for J and K)magfloatnullableKmag? K magnitude (from 2MASS or DENIS)magfloatnullableGroup[1/6] J spectral group numberintcindexCarbon c index (1)floatjindexIsotopic j index (Keenan, 1993PASP..105..905K) (2)float13C13C[0/2] Code denoting the strength of the ^13^C^13^C {lambda}6144 band (3)intNote[+ *] Note (4)char2MASSDisplay the dat from 2MASS Catalog (II/246)char