J/ApJ/658/367ivo://CDS.VizieR/J/ApJ/658/367doi:10.26093/cds/vizier.16580367CDSKomiya Y.Suda T.Minaguchi H.Shigeyama T.Aoki W.Fujimoto M.Y.2017-12-06T07:38:43Z2009-03-16T16:04:12ZCDS support team

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

cds-question@unistra.frcarbon-starschemical-abundancesIt is known that the carbon-enhanced, extremely metal-poor (CEMP) stars constitute a substantial proportion of the extremely metal-poor (EMP) stars of the Galactic halo, and a by far larger proportion than CH stars among Population II stars. We investigate their origin by taking into account an additional evolutionary path to the surface carbon enrichment, triggered by hydrogen engulfment by the helium flash convection, in EMP stars with [Fe/H]<~-2.5. This process is distinct from the third dredge-up operating in more metal-rich stars and in EMP stars. In binary systems of EMP stars, the secondary stars become CEMP stars through mass transfer from the low- and intermediate- mass primary stars that have developed the surface carbon enhancement. Our binary scenario can predict the variations in the abundances not only for carbon but also for nitrogen and s-process elements and can reasonably explain the observed properties such as the stellar distributions of the carbon abundances, the binary periods, and the evolutionary stages.2007ApJ...658..367Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/658/367CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/227 : General Catalog of galactic Carbon stars, 3d Ed. (Alksnis+ 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/658/367https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/658/367http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/658/367https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/658/367https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/658/367http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/658/367GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/658/367/table1 (Observational sample of CEMP star from literature (Carbon-enhanced, Extremely Metal-Poor stars))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/658/367/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/658/367/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/658/367/table1?GETtext/xml+votable180.050000true6.865-25.10722220.005555555555555556Cone search capability for table J/ApJ/658/367/table2 (Observational sample of CH or Ba star from Literature)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/658/367/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/658/367/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/658/367/table2?GETtext/xml+votable180.050000true135.884466753.10828420.0055555555555555566/1236 1847 3367 4041 4423 5529 5624 6170 7229 8197 8228 8244 8278 8314 10368 10430 12658 12771 12880 13087 13244 13288 15363 15364 15374 15481 16365 16654 16659 16679 16680 16814 16880 16892 17091 17221 17392 17398 17623 17919 17994 18683 18719 19210 19466 19560 19923 20110 20547 21328 22221 22331 23199 23328 24350 24828 25008 25105 25575 25733 26089 26191 26357 26655 27106 27752 27958 30553 30640 31136 32086 34166 34961 35009 35286 35549 35752 36228 36537 38117 38545 38792 38806 38893 39323 39786 39851 40139 40494 41813 42964 43319 43321 43665 43778 44016 44721 45001 45494 45676 45745 45796 45825 46704 46792 47344 47396 48173 48234 48501 48516 48555 48628 48722 48883 48918 48998 49078https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/658/367?format=asciiOpticaldefaultJ/ApJ/658/367/table1Observational sample of CEMP star from literature (Carbon-enhanced, Extremely Metal-Poor stars)e? Orbital eccentricitysrc.orbital.eccentricityfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDesStellar description (4)meta.notecharNameObject name (1)meta.id;meta.maincharn_Name[a] Individual note (2)meta.notecharl_PerLimit flag on Permeta.code.errorcharPer? Orbital Perioddtime.periodfloatnullablen_Per[?] Uncertainty flag on Permeta.notecharf_Per[b] Binarity (3)meta.codecharn_e[?] Uncertainty flag on emeta.notecharlogg? Log of the surface gravitylog(cm.s**-2)phys.gravityfloatnullablen_logg[?] Uncertainty flag on loggmeta.notechar[Fe/H]Log of the Fe/H abundancelog(Sun)phys.abund.Fefloat[C/Fe]Log of the C/Fe abundancephys.abundfloat[N/Fe]? Log of the N/Fe abundancephys.abundfloatnullablel_[O/Fe]Limit flag on [O/Fe]meta.code.error;phys.abundchar[O/Fe]? Log of the O/Fe abundancephys.abundfloatnullable[Sr/Fe]? Log of the Sr/Fe abundancephys.abundfloatnullablel_[Ba/Fe]Limit flag on [Ba/Fe]meta.code.error;phys.abundchar[Ba/Fe]Log of the Ba/Fe abundancephys.abundfloatl_[Pb/Fe]Limit flag on [Pb/Fe]meta.code.error;phys.abundchar[Pb/Fe]? Log of the Pb/Fe abundancephys.abundfloatnullableRefReference(s), in refs.dat filemeta.ref;pos.frame;meta.filecharSimbadNameSimbad column added by the CDSmeta.idchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/ApJ/658/367/table2Observational sample of CH or Ba star from LiteratureBin[y/n ?] Binarity (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject namemeta.id;meta.maincharl_PerLimit flag on Permeta.code.errorcharPer? Orbital perioddtime.periodfloatnullable[Fe/H]? Log of the Fe/H abundancelog(Sun)phys.abund.Fefloatnullable[C/H]? Log of the C/H abundancephys.abundfloatnullable[C/Fe]? Log of the C/Fe abundancephys.abundfloatnullable[Ba/Fe]? Log of the Ba/Fe abundancephys.abundfloatnullableClassClassification (2)meta.code.classcharRefReference(s), in refs.dat filemeta.ref;pos.frame;meta.filecharSimbadNameSimbad column added by the CDSmeta.idchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullableJ/ApJ/658/367/refsReferencesComCommentsmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorchar