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CNO abundances in the globular clusters NGC 1851 and NGC 6752

Yong, David; Grundahl, Frank; Norris, John

Description

We measure the C+N+O abundance sum in red giant stars in two Galactic globular clusters, NGC 1851 and NGC 6752. NGC 1851 has a split subgiant branch which could be due to different ages or C+N+O content while NGC 6752 is representative of the least complex globular clusters. For NGC 1851 and NGC 6752, we obtain average values of A(C+N+O) = 8.16 ± 0.10 (σ = 0.34) and 7.62 ± 0.02 (σ = 0.06), respectively. When taking into account the measurement errors, we find a constant C+N+O abundance sum...[Show more]

dc.contributor.authorYong, David
dc.contributor.authorGrundahl, Frank
dc.contributor.authorNorris, John
dc.date.accessioned2018-11-29T22:53:49Z
dc.date.available2018-11-29T22:53:49Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/152581
dc.description.abstractWe measure the C+N+O abundance sum in red giant stars in two Galactic globular clusters, NGC 1851 and NGC 6752. NGC 1851 has a split subgiant branch which could be due to different ages or C+N+O content while NGC 6752 is representative of the least complex globular clusters. For NGC 1851 and NGC 6752, we obtain average values of A(C+N+O) = 8.16 ± 0.10 (σ = 0.34) and 7.62 ± 0.02 (σ = 0.06), respectively. When taking into account the measurement errors, we find a constant C+N+O abundance sum in NGC 6752. The C+N+O abundance dispersion is only 0.06 dex, and such a result requires that the source of the light element abundance variations does not increase the C+N+O sum in this cluster. For NGC 1851, we confirm a large spread in C+N+O. In this cluster, the anomalous RGB has a higher C+N+O content than the canonical RGB by a factor of 4 (∼0.6 dex). This result lends further support to the idea that the two subgiant branches in NGC 1851 are roughly coeval, but with different CNO abundances.
dc.format.mimetypeapplication/pdf
dc.publisherBlackwell Publishing Ltd
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleCNO abundances in the globular clusters NGC 1851 and NGC 6752
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume446
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationu4571891xPUB34
local.type.statusPublished Version
local.contributor.affiliationYong, David, College of Science, ANU
local.contributor.affiliationGrundahl, Frank, University of Aarhus
local.contributor.affiliationNorris, John, College of Science, ANU
local.bibliographicCitation.issue4
local.bibliographicCitation.startpage3319
local.bibliographicCitation.lastpage3329
local.identifier.doi10.1093/mnras/stu2334
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2018-11-29T07:55:25Z
local.identifier.scopusID2-s2.0-84985014352
local.identifier.thomsonID000350272400007
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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