J/A+A/549/A110ivo://CDS.VizieR/J/A+A/549/A110doi:10.26093/cds/vizier.35490110CDSGeier S.2018-01-04T08:22:33Z2013-01-08T11:09:33ZCDS support team

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

cds-question@unistra.frsubdwarf-starsb-starsstellar-atmosphereschemical-abundancesHot subdwarf B stars (sdBs) are considered to be core helium-burning stars with very thin hydrogen envelopes situated on or near the extreme horizontal branch (EHB). The formation of sdBs is still unclear as well as the chemical composition of their atmospheres. The observed helium depletion is attributed to atmospheric diffusion. Metal abundances have been determined for about a dozen sdBs only resulting in puzzling patterns with enrichment of heavy metals and depletion of lighter ones. In this paper we present a detailed metal abundance analysis of 106 sdBs. From high resolution spectra we measured elemental abundances of up to 24 different ions per star. A semi-automatic analysis pipeline was developed to calculate and fit LTE models to a standard set of spectral lines. A general trend of enrichment was found with increasing temperature for most of the heavier elements. The lighter elements like carbon, oxygen and nitrogen are depleted and less affected by temperature. Although there is considerable scatter from star to star, the general abundance patterns in most sdBs are similar. State-of-the-art diffusion models predict such patterns and are in qualitative agreement with our results. However, the highest enrichments measured cannot not be explained with these models. Peculiar line shapes of the strongest metal lines in some stars indicate vertical stratification to be present in the atmospheres. Such effects are not accounted for in current diffusion models and may be responsible for some of the yet unexplained abundance anomalies.2013A&A...549A.110Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/549/A110CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/442/1023 : Radial velocity of 17 bright subdwarf B (Edelmann+, 2005)J/A+A/513/A6 : NOT survey of subdwarf B stars (Ostensen+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/549/A110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/549/A110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/549/A110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/549/A110https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/549/A110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/549/A110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/549/A110/abund (Metal abundances)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/549/A110/abund?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/549/A110/abund?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/549/A110/abund?GETtext/xml+votable180.050000true28.2966667-39.07166670.0055555555555555566/4319 4610 4938 6108 8245 8770 8982 9664 9683 10048 10903 11171 11680 12430 13999 15065 16430 16529 16551 16625 16629 16672 16744 17323 18098 18132 18346 18372 18451 18550 18601 18738 18774 18906 18941 18997 19057 19068 19372 19741 20236 20279 20383 22784 23244 24701 24755 25376 25566 25957 26007 26533 26609 26748 26808 26837 26872 27126 27177 27956 28390 28586 28973 30939 31337 31491 31613 32476 32752 33795 33859 34101 34127 34699 34958 35150 35251 35640 35713 35720 35767 35769 35781 35798 36679 36720 43919 44217-44218 44659 44671 44789 44816 44948 45027 45270 45443 45998 46295 46637 46766 46795 46859 46903 47571 48621https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/549/A110?format=asciiOpticaldefaultJ/A+A/549/A110/abundMetal abundancesTiIV? TiIV abundancephys.abundfloatnullableOII? OII abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharn_NameVariability or peculiarity (1)meta.notecharTeffEffective temperatureKphys.temperature.effectiveintl_HeI/IIUpper limit flag on HeI/IImeta.code.errorcharHeI/IIHe abundancephys.abund.Yfloatl_CIIUpper limit flag on CIImeta.code.errorcharCII? CII abundancephys.abundfloatnullablee_CII? uncertainty of CIIstat.errorfloatnullablel_CIIIUpper limit flag on CIIImeta.code.errorcharCIII? CIII abundancephys.abundfloatnullablee_CIII? uncertainty of CIIIstat.errorfloatnullablel_NIIUpper limit flag on NIImeta.code.errorcharNII? NII abundancephys.abundfloatnullablee_NII? uncertainty of NIIstat.errorfloatnullablel_NIIIUpper limit flag on NIIImeta.code.errorcharNIII? NIII abundancephys.abundfloatnullablee_NIII? uncertainty of NIIIstat.errorfloatnullablel_OIIUpper limit flag on OIImeta.code.errorchare_OII? uncertainty of OIIstat.errorfloatnullablel_NeIIUpper limit flag on NeIImeta.code.errorcharNeII? NeII abundancephys.abundfloatnullablee_NeII? uncertainty of NeIIstat.errorfloatnullablel_MgIIUpper limit flag on MgIImeta.code.errorcharMgII? MgII abundancephys.abundfloatnullablee_MgII? uncertainty of MgIIstat.errorfloatnullablel_AlIIIUpper limit flag on AlIIImeta.code.errorcharAlIII? AlIII abundancephys.abundfloatnullablee_AlIII? uncertainty of AlIIIstat.errorfloatnullablel_SiIIIUpper limit flag on SiIIImeta.code.errorcharSiIII? SiIII abundancephys.abundfloatnullablee_SiIII? uncertainty of SiIIIstat.errorfloatnullablel_SiIVUpper limit flag on SiIVmeta.code.errorcharSiIV? SiIV abundancephys.abundfloatnullablee_SiIV? uncertainty of SiIVstat.errorfloatnullablel_PIIIUpper limit flag on PIIImeta.code.errorcharPIII? PIII abundancephys.abundfloatnullablee_PIII? uncertainty of PIIIstat.errorfloatnullablel_SIIUpper limit flag on SIImeta.code.errorcharSII? SII abundancephys.abundfloatnullablee_SII? uncertainty of SIIstat.errorfloatnullablel_SIIIUpper limit flag on SIIImeta.code.errorcharSIII? SIII abundancephys.abundfloatnullablee_SIII? uncertainty of SIIIstat.errorfloatnullablel_ArIIUpper limit flag on ArIImeta.code.errorcharArII? ArII abundancephys.abundfloatnullablee_ArII? uncertainty of ArIIstat.errorfloatnullablel_KIIUpper limit flag on KIImeta.code.errorcharKII? KII abundancephys.abundfloatnullablee_KII? uncertainty of KIIstat.errorfloatnullablel_CaIIIUpper limit flag on CaIIImeta.code.errorcharCaIII? CaIII abundancephys.abundfloatnullablee_CaIII? uncertainty of CaIIIstat.errorfloatnullablel_ScIIIUpper limit flag on ScIIImeta.code.errorcharScIII? ScIII abundancephys.abundfloatnullablee_ScIII? uncertainty of ScIIIstat.errorfloatnullablel_TiIIIUpper limit flag on TiIIImeta.code.errorcharTiIII? TiIII abundancephys.abundfloatnullablee_TiIII? uncertainty of TiIIIstat.errorfloatnullablel_TiIVUpper limit flag on TiIVmeta.code.errorchare_TiIV? uncertainty of TiIVstat.errorfloatnullablel_VIIIUpper limit flag on VIIImeta.code.errorcharVIII? VIII abundancephys.abundfloatnullablee_VIII? uncertainty of VIIIstat.errorfloatnullablel_CrIIIUpper limit flag on CrIIImeta.code.errorcharCrIII? CrIII abundancephys.abundfloatnullablee_CrIII? uncertainty of CrIIIstat.errorfloatnullablel_FeIIIUpper limit flag on FeIIImeta.code.errorcharFeIII? FeIII abundancephys.abundfloatnullablee_FeIII? uncertainty of FeIIIstat.errorfloatnullablel_CoIIIUpper limit flag on CoIIImeta.code.errorcharCoIII? CoIII abundancephys.abundfloatnullablee_CoIII? uncertainty of CoIIIstat.errorfloatnullablel_ZnIIIUpper limit flag on ZnIIImeta.code.errorcharZnIII? ZnIII abundancephys.abundfloatnullablee_ZnIII? uncertainty of ZnIIIstat.errorfloatnullableSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main