Manganese Abundances In The Globular Cluster Omega Centauri

dc.contributor.utaustinauthorLambert, David L.en_US
dc.creatorCunha, Katiaen_US
dc.creatorSmith, Verne V.en_US
dc.creatorBergemann, Mariaen_US
dc.creatorSuntzeff, Nicholas B.en_US
dc.creatorLambert, David L.en_US
dc.date.accessioned2016-04-28T19:35:54Z
dc.date.available2016-04-28T19:35:54Z
dc.date.issued2010-07en
dc.description.abstractWe present manganese abundances in 10 red giant members of the globular cluster omega Centauri; eight stars are from the most metal-poor population (RGB MP and RGB MInt1) while two targets are members of the more metal-rich groups (RGB MInt2 and MInt3). This is the first time Mn abundances have been studied in this peculiar stellar system. The LTE values of [Mn/Fe] in omega Cen overlap those of Milky Way stars in the metal-poor. Cen populations ([Fe/H] similar to -1.5 to -1.8), however unlike what is observed in Milky Way halo and disk stars, [Mn/Fe] declines in the two more metal-rich RGB MInt2 and MInt3 targets. Non-LTE calculations were carried out in order to derive corrections to the LTE Mn abundances. The non-LTE results for omega Cen in comparison with the non-LTE [Mn/Fe] versus [Fe/H] trend obtained for the Milky Way confirm and strengthen the conclusion that the manganese behavior in omega Cen is distinct. These results suggest that low-metallicity supernovae (with metallicities <= -2) of either Type II or Type Ia dominated the enrichment of the more metal-rich stars in omega Cen. The dominance of low-metallicity stars in the chemical evolution of omega Cen has been noted previously in the s-process elements where enrichment from metal-poor asymptotic giant branch stars is indicated. In addition, copper, which also has metallicity-dependent yields, exhibits lower values of [Cu/Fe] in the RGB MInt2 and MInt3 omega Cen populations.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNational Science Foundation AST 06-46790en_US
dc.description.sponsorshipRobert A.Welch Foundation F-634en_US
dc.identifierdoi:10.15781/T2SV4B
dc.identifier.Filename2010_07_manganeseabundances.pdfen_US
dc.identifier.citationCunha, Katia, Verne V. Smith, Maria Bergemann, Nicholas B. Suntzeff, and David L. Lambert. "Manganese abundances in the globular cluster ? Centauri." The Astrophysical Journal, Vol. 717, No. 1 (Jul., 2010): 333.en_US
dc.identifier.doi10.1088/0004-637x/717/1/333en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34859
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectglobular clusters: individual (omega centauri)en_US
dc.subjectmetal-poor starsen_US
dc.subjectsampling model atmospheresen_US
dc.subjectcool dwarf starsen_US
dc.subjectchemicalen_US
dc.subjectevolutionen_US
dc.subjectgalactic bulgeen_US
dc.subjectkinetic equilibriumen_US
dc.subjectsolar spectrumen_US
dc.subjectgianten_US
dc.subjectbranchen_US
dc.subjectfield starsen_US
dc.subjectred giantsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleManganese Abundances In The Globular Cluster Omega Centaurien_US
dc.typeArticleen_US

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