J/A+A/487/307ivo://CDS.VizieR/J/A+A/487/307doi:10.26093/cds/vizier.34870307CDSMorel T.Butler K.2017-09-19T14:23:59Z2008-09-28T13:43:19ZCDS support team

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

cds-question@unistra.frearly-type-starsb-starschemical-abundancesThe recent downward revision of the solar photospheric abundances now leads to severe inconsistencies between the theoretical predictions for the internal structure of the Sun and the results of helioseismology. There have been claims that the solar neon abundance may be underestimated and that an increase in this poorly-known quantity could alleviate (or even completely solve) this problem. Early-type stars in the solar neighbourhood are well-suited to testing this hypothesis because they are the only stellar objects whose absolute neon abundance can be derived from the direct analysis of photospheric lines. Here we present a fully homogeneous NLTE abundance study of the optical Ne I and Ne II lines in a sample of 18 nearby, early B-type stars, which suggests log[epsilon(Ne)]=7.97+/-0.07dex (on the scale in which log[epsilon(H)=12)]) for the present-day neon abundance of the local ISM. Chemical evolution models of the Galaxy only predict a very small enrichment of the nearby interstellar gas in neon over the past 4.6Gyr, implying that our estimate should be representative of the Sun at birth. Although higher by about 35% than the new recommended solar abundance, such a value appears insufficient by itself to restore the past agreement between the solar models and the helioseismological constraints.2008A&A...487..307Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/487/307CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/412/495 : Equivalent widths for 6 RS CVn systems (Morel+, 2003)J/A+A/423/677 : Chromospherically active stars oxygen abundances (Morel+ 2004)J/A+A/426/1007 : Abundances of 8 single-lined active binaries (Morel+, 2004)J/A+A/457/651 : Abundance of nine beta Cephei stars (Morel+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/487/307https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/487/307http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/487/307https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/487/307https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/487/307http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/487/307GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/487/307/stars (Star positions (from Simbad))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/487/307/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/487/307/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/487/307/stars?GETtext/xml+votable180.050000true340.36958340.2255560.0055555555555555566/13729 16144 17754 19676 20782 20834 20847 20915 22772 22859 23007 23360 30302 30440 31063 39853 42948 44066https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/487/307?format=asciiOpticaldefaultJ/A+A/487/307/starsStar positions (from Simbad)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharprimaryRAJ2000Simbad Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000.0)pos.eq.dec;meta.mainBmagSimbad B band magnitudemagphot.mag;em.opt.BfloatVmag? Simbad V band magnitudemagphot.mag;em.opt.VfloatnullableSpTypeSimbad MK spectral typesrc.spTypecharSimbadSimbad column added by the CDScharJ/A+A/487/307/tableb1loggf values, EW measurements and line-by-line abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharIonIon designationmeta.id;phys.atmol.ionStagecharlambdaMean line wavelength0.1nmem.wl;stat.meanfloatloggfloggf valuephys.atmol.oscStrengthfloatEW? Equivalent width0.1pmspect.line.eqWidthfloatnullableAbund? Abundance, on log[epsilon(H)]=12 scaleinstr.scalefloatnullable