J/A+A/426/1007ivo://CDS.VizieR/J/A+A/426/1007doi:10.26093/cds/vizier.34261007CDSMorel T.Micela G.Favata F.Katz D.Pillitteri I.2017-12-22T05:32:34Z2005-01-16T15:12:15ZCDS support team

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

cds-question@unistra.frvariable-starschemically-peculiar-starsWe report the determination from high-resolution spectra of the atmospheric parameters and abundances of 13 chemical species (among which lithium) in 8 single-lined active binaries. These data are combined with our previous results for 6 other RS CVn systems to examine a possible relationship between the photospheric abundance patterns and the stellar activity level. The stars analyzed are generally found to exhibit peculiar abundance ratios compared to inactive, galactic disk stars of similar metallicities. We argue that this behaviour is unlikely an artefact of errors in the determination of the atmospheric parameters or non-standard mixing processes along the red giant branch, but diagnoses instead the combined action of various physical processes related to activity. The most promising candidates are cool spot groups covering a very substantial fraction of the stellar photosphere or NLTE effects arising from nonthermal excitation. However, we cannot exclude the possibility that more general shortcomings in our understanding of K-type stars (e.g. inadequacies in the atmospheric models) also play a significant role. Lastly, we call attention to the unreliability of the (V-R) and (V-I) colour indices as temperature indicators in chromospherically active stars.2004A&A...426.1007Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/426/1007CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/412/495 : Equivalent widths for 6 RS CVn systems (Morel+, 2003)J/A+A/423/677 : Oxygen abundances in chromospherically active starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/426/1007https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/426/1007http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/426/1007https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/426/1007https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/426/1007http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/426/1007GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/426/1007/stars (List of the stars studied)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/426/1007/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/426/1007/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/426/1007/stars?GETtext/xml+votable180.050000true1.33375-5.70750.0055555555555555566/17368 18591 18840 18888 19531 19718 29009 31039 31581 33774 36819 45938 47872 48225 48620https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/426/1007?format=asciiOpticaldefaultJ/A+A/426/1007/starsList of the stars studiedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intHDHD number (Cat. <III/135>)intNameOther name of the star (1)charRAJ2000Right Ascension J2000 (hours) (1)pos.eq.ra;meta.mainDEJ2000Declination J2000 (degrees) (1)pos.eq.dec;meta.mainBmagMagnitude in B (1)magfloatVmagMagnitude in V (1)magfloatSpMK Spectral type (1)charSimbadSimbad column added by the CDScharJ/A+A/426/1007/tablea1Calibrated atomic data and EW measurementsIonIon designationcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intSolAbunKurucz solar abundance (logarithmic scale, H=12)floatLambdaWavelength0.1nmdoubleEPExcitation potentialeVfloatloggfCalibrated log(gf)-valuefloatEWHD28? Equivalent width for HD 28 (1)0.1pmfloatnullableEWHD1227? Equivalent width for HD 1227 (1)0.1pmfloatnullableEWHD4482? Equivalent width for HD 4482 (1)0.1pmfloatnullableEWHD17006? Equivalent width for HD 17006 (1)0.1pmfloatnullableEWHD19754? Equivalent width for HD 19754 (1)0.1pmfloatnullableEWHD154619? Equivalent width for HD 154619 (1)0.1pmfloatnullableEWHD156266? Equivalent width for HD 156266 (1)0.1pmfloatnullableEWHD181809? Equivalent width for HD 181809 (1)0.1pmfloatnullableEWHD182776? Equivalent width for HD 182776 (1)0.1pmfloatnullableEWHD202134? Equivalent width for HD 202134 (1)0.1pmfloatnullableEWHD204128? Equivalent width for HD 204128 (1)0.1pmfloatnullableEWHD205249? Equivalent width for HD 205249 (1)0.1pmfloatnullableEWHD211391? Equivalent width for HD 211391 (1)0.1pmfloatnullableEWHD217188? Equivalent width for HD 217188 (1)0.1pmfloatnullableEWHD218527? Equivalent width for HD 218527 (1)0.1pmfloatnullable