J/A+A/423/677ivo://CDS.VizieR/J/A+A/423/677doi:10.26093/cds/vizier.34230677CDSMorel T.Micela G.2005-03-11T06:18:42Z2005-03-11T07:18:25ZCDS support team

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

cds-question@unistra.frvariable-starschemical-abundancesWe discuss oxygen abundances derived from [O I] 6300 and the O I triplet in stars spanning a wide range in chromospheric activity level, and show that these two indicators yield increasingly discrepant results with higher chromospheric/coronal activity measures. While the forbidden and permitted lines give fairly consistent results for solar-type disk dwarfs, spuriously high O I triplet abundances are observed in young Hyades and Pleiades stars, as well as in individual components of RS CVn binaries (up to 1.8dex). The distinct behaviour of the [O I]-based abundances which consistently remain near-solar suggests that this phenomenon mostly results from large departures from LTE affecting the O I triplet at high activity level that are currently unaccounted for, but also possibly from a failure to adequately model the atmospheres of K-type stars. These results suggest that some caution should be exercised when interpreting oxygen abundances in active binaries or young open cluster stars.2004A&A...423..677Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/423/677CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/412/495 : Equivalent widths for 6 RS CVn systems (Morel+, 2003)J/A+A/426/1007 : Abundances of 8 single-lined active binaries (Morel+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/423/677https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/423/677http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/423/677https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/423/677https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/423/677http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/423/677GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/423/677/table2 (Oxygen abundances and activity indices)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/423/677/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/423/677/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/423/677/table2?GETtext/xml+votable180.050000true1.33392-5.7076180.0055555555555555566/62 342 461 463 472 474 496 1032 1042 1058 1341 2476 2777 3020 6523 8476 8746 10375 12592 12944 15174 16069 16386 17368 17606 18591 18614 18726 18821 18840 18888 19531 19585 19718 20145 20593 20739 22654 23190 23201 23230 23454 23497 23503 23535 23537-23538 23548 23583 26133 26975 28987 29009 29210 30665 30848 31029 31039 31132 31478 31581 32473 33224 33552 33717 33774 35799 36365 36693 36819 37408 38550 39383 41272 41679 42248 42760 43544 43828 45669 45938 47377 47872 48105 48225 48283 48620 49114https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/423/677?format=asciiOpticaldefaultJ/A+A/423/677/table2Oxygen abundances and activity indicesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intStarStar name (1)charTeffEffective temperatureKint[Fe/H]Iron abundance (2)log(Sun)floate_[Fe/H]Iron abundance uncertainty (2)log(Sun)float[O/Fe]6300? Oxygen abundance yielded by [O I] 6300 (3)log(Sun)floatnullablee_[O/Fe]6300? Uncertainty for the oxygen abundance yielded by [O I] 6300 (3)log(Sun)floatnullable[O/Fe]trip? Oxygen abundance yielded by the O I-7774 triplet (3)log(Sun)floatnullablee_[O/Fe]trip? Uncertainty for the oxygen abundance yielded by the O I-7774 triplet (3)log(Sun)floatnullabler_[O/Fe]tripReference code for the oxygen abundance data (in refs.dat file)intlog(R'HK)? Activity index derived from the Ca II H+K lines (4)floatnullablee_log(R'HK)? Uncertainty for the activity index derived from the Ca II H+K lines (4)floatnullabler_log(R'HK)? Reference code for the R'HK data (in refs.dat file)intnullablelogLX? ROSAT X-ray luminosity (5)log(1e-07W)floatnullablee_logLX? ROSAT X-ray luminosity uncertainty (5)log(1e-07W)floatnullablelogRX? Activity index derived from the X-ray data (5)floatnullablee_logRX? Uncertainty for the activity index derived from the X-ray data (5)floatnullablef_logRX? X-ray detection flag (6)intnullabler_logRX? Reference code for the RX data (in refs.dat file)intnullable_RAPosition (from SIMBAD) (right ascension part)degpos.eq.ra;meta.main_DEPosition (from SIMBAD) (declination part)degpos.eq.dec;meta.mainJ/A+A/423/677/refsReferencesComCommentscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intRefReference codeintBibCodeBibCodecharAutAuthor's namechar