J/ApJS/119/141ivo://CDS.VizieR/J/ApJS/119/141doi:10.26093/cds/vizier.21190141CDSSloan G.C.Price S.D.2000-01-20T08:30:45Z2000-01-20T09:30:38ZCDS support team

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

cds-question@unistra.frvariable-starsmorgan-keenan-classificationinfrared-photometryThis paper presents infrared spectral classifications for a flux-limited sample of 635 optically identified oxygen-rich variables including supergiants and sources on the asymptotic giant branch (AGB). Several classes of spectra from oxygen-rich dust exist, and these can be arranged in a smoothly varying sequence of spectral shapes known as the silicate dust sequence. Classification based on this sequence reveals several dependencies of the dust emission on the properties of the central star. Nearly all S stars show broad emission features from alumina dust, while most of the supergiants exhibit classic features from amorphous silicate dust. Mira variables with symmetric light curves generally show broad alumina emission, while those with more asymmetric light curves show classic silicate emission. These differences may arise from differences in the photospheric C/O ratio.1998ApJS..119..141Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/119/141CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/119/141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/119/141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/119/141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/119/141https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/119/141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/119/141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJS/119/141/table4Infrared spectral classifications of the AGB samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.intIRASIRA-PSC (Cat. <II/125>) designationcharm_IRASMultilicity index on IRAScharNameNamecharVarVariability type (1)charPer? PerioddfloatnullableSpTypeSpectral Typechar12um12{mu}m magnitudemagfloat[12]-[25]Colour index [12]-[25]magfloatLRS? LRS characterisations described in the LRS AtlasintnullableDECDust emission contrast (2)floatF11/F12Corrected flux ratio F11{mu}m/F12{mu}mfloatDustInfrared emission class (3)charJ/ApJS/119/141/table5Infrared spectral classifications of the supergiantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intIRASIRA-PSC (Cat. <II/125>) designationcharm_IRASMultilicity index on IRAScharNameNamecharVarVariability type (1)charPer? PerioddfloatnullableSpTypeSpectral Typechar12um12{mu}m magnitudemagfloat[12]-[25]Colour index [12]-[25]magfloatLRS? LRS characterisations described in the LRS AtlasintnullableDECDust emission contrast (2)floatF11/F12Corrected flux ratio F11{mu}m/F12{mu}mfloatDustInfrared emission class (3)charJ/ApJS/119/141/table6Infrared spectral classifications of the optical S starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intIRASIRA-PSC (Cat. <II/125>) designationcharm_IRASMultilicity index on IRAScharNameNamecharVarVariability type (1)charPer? PerioddfloatnullableSpTypeSpectral Typechar12um12{mu}m magnitudemagfloat[12]-[25]Colour index [12]-[25]magfloatLRS? LRS characterisations described in the LRS AtlasintnullableDECDust emission contrast (2)floatF11/F12Corrected flux ratio F11{mu}m/F12{mu}mfloatDustInfrared emission class (3)charJ/ApJS/119/141/table9MS (oxygen-rich AGB or supergiant) starsIRASIRAS-PSC designationcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.int