J/ApJ/811/45ivo://CDS.VizieR/J/ApJ/811/45doi:10.26093/cds/vizier.18110045CDSSloan G.C.Goes C.Ramirez R.M.Kraemer K.E.Engelke C.W.2017-12-07T07:27:31Z2015-12-30T08:44:35ZCDS support team

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

cds-question@unistra.frm-starsinfrared-astronomyspectroscopyWe observed a sample of 20 M giants with the Infrared Spectrograph on the Spitzer Space Telescope. Most show absorption structure at 6.6-6.8um which we identify as water vapor, and in some cases, the absorption extends from 6.4um into the SiO band at 7.5um. Variable stars show stronger H_2_O absorption. While the strength of the SiO fundamental at 8um increases monotonically from spectral class K0 to K5, the dependence on spectral class weakens in the M giants. As with previously studied samples, the M giants show considerable scatter in SiO band strength within a given spectral class. All of the stars in our sample also show OH band absorption, most noticeably in the 14-17um region. The OH bands behave much like the SiO bands, increasing in strength in the K giants but showing weaker dependence on spectral class in the M giants, and with considerable scatter. An examination of the photometric properties reveals that the V-K color may be a better indicator of molecular band strength than the spectral class. The transformation from Tycho colors to Johnson B-V color is double-valued, and neither B-V nor B_T_-V_T_ color increases monotonically with spectral class in the M giants like they do in the K giants.2015ApJ...811...45Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/811/45CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/811/45https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/811/45http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/811/45https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/811/45https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/811/45http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/811/45GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/811/45/table1 (Particulars for the 20 M giants)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/811/45/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/811/45/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/811/45/table1?GETtext/xml+votable180.050000true32.5644583-61.09697220.0055555555555555566/6485 10909 14825 24701 33492 33574 33898 34419 35412 36265 36447 37471 37542 37585 43378 43862 45455 45627 46146 475181.2932132981302573e-20 2.1346512726771855e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/811/45?format=asciiInfrareddefaultJ/ApJ/811/45/table1Particulars for the 20 M giantsVarclassVariability classmeta.code.class;src.varcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of target used in filenames name.sp.datmeta.id;instr.setupcharTargetPreferred name of the targetmeta.id;meta.maincharAliasAlternative name of the targetmeta.idcharRAJ2000Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Declination (J2000.0)pos.eq.dec;meta.mainSptypeSpectral type from the literaturesrc.spTypecharF12IRAS flux density at 12um in Jy (1)Jyphot.flux.density;em.IR.8-15umfloatAORkeyAOR key for the Spitzer Space Telescopemeta.idintspShow the spectrummeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar