J/ApJ/690/L122ivo://CDS.VizieR/J/ApJ/690/L122doi:10.26093/cds/vizier.16909122CDSCami J.Sloan G.C.Markwick-Kemper A.J.Zijlstra A.A.,Bauschlicher C.W. JrMatsuura M.Decin L.Hony S.2009-03-07T21:50:10Z2009-03-07T22:45:27ZCDS support team

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

cds-question@unistra.fratomic-physicsWe present Spitzer spectra of S stars, which are cool evolved stars with a C/O ratio near unity, some of which have enhanced s-process abundances. We present the detection of a strong and unusual band in the mid-infrared, at 13um, within the N-band window. Using quantum-chemically calculated line lists, and model spectra, we identify this band as the fundamental rovibrational band of SiS. Detection of the overtone band at 6.7um confirms the identification Fitting the line profile shows that the molecule is located in relatively cool layers, at T~1500K. We discuss these results in the context of chemical equilibrium models. The observed strength of these bands in the cool S stars makes them a promising observational diagnostic tool for studying the atmospheres of brown dwarfs and exoplanets.2009ApJ...690L.122Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/690/L122CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/690/L122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/690/L122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/690/L122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/690/L122https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/690/L122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/690/L122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/690/L122/sisSiS line listELower state energycm**-1phys.energy;phys.atmol.leveldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintsigmaTransition frequencycm**-1em.freq;phys.atmol.transitiondoubleAEinstein transition probability (A-value)s**-1phys.atmol.transProbdoublevlLower state vibrational quantum numberphys.atmol.qnintvuUpper state vibrational quantum numberphys.atmol.qnintJlLower state angular momentum quantum numberphys.atmol.qnintJuUpper state angular momentum quantum numberphys.atmol.qnint