Searching For Chemical Signatures Of Multiple Stellar Populations In The Old, Massive Open Cluster NGC 6791

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dc.contributor.utaustinauthorSneden, Christopheren_US
dc.creatorBragaglia, Angelaen_US
dc.creatorSneden, Christopheren_US
dc.creatorCarretta, Eugenioen_US
dc.creatorGratton, Raffaele G.en_US
dc.creatorLucatello, Saraen_US
dc.creatorBernath, Peter F.en_US
dc.creatorBrooke, James S. A.en_US
dc.creatorRam, Ram S.en_US
dc.date.accessioned2016-04-28T19:32:22Z
dc.date.available2016-04-28T19:32:22Z
dc.date.issued2014-11en
dc.description.abstractGalactic open and globular clusters (OCs, GCs) appear to inhabit separate regions of the age-mass plane. However, the transition between them is not easily defined because there is some overlap between high-mass, old OCs and low-mass, young GCs. We are exploring the possibility of a clear-cut separation between OCs and GCs using an abundance feature that has been found so far only in GCs: (anti) correlations between light elements. Among the coupled abundance trends, the Na-O anticorrelation is the most widely studied. These anticorrelations are the signature of self-enrichment, i.e., of a formation mechanism that implies multiple generations of stars. Here we concentrate on the old, massive, metal-rich OC NGC 6791. We analyzed archival Keck/HIRES spectra of 15 NGC 6791 main-sequence turnoff and evolved stars, concentrating on the derivation of C, N, O, and Na abundances. We also used WIYN/Hydra spectra of 21 evolved stars (one is in common). Given the spectral complexity of the very metal-rich NGC 6791 stars, we employed spectrum synthesis to measure most of the abundances. We confirmed the cluster super-solar metallicity and abundances of Ca and Ni that have been derived in past studies. More importantly, we did not detect any significant star-to-star abundance dispersion in C, N, O, and Na. Based on the absence of a clear Na-O anticorrelation, NGC 6791 can still be considered a true OC, hosting a single generation of stars and not a low-mass GC.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipU.S. National Aeronautics and Space Administration (NASA)en_US
dc.description.sponsorshipU.S. National Science Foundation (NSF) AST-0908978, AST-1211585en_US
dc.description.sponsorshipUniversity of Texasen_US
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TBITAK) 112T929en_US
dc.description.sponsorshipLeverhulme Trust (UK)en_US
dc.description.sponsorshipNASA laboratory astrophysics programen_US
dc.identifierdoi:10.15781/T2622C
dc.identifier.Filename2014_11_ngc6791.pdfen_US
dc.identifier.citationBragaglia, Angela, Christopher Sneden, Eugenio Carretta, Raffaele G. Gratton, Sara Lucatello, Peter F. Bernath, James SA Brooke, and Ram S. Ram. "Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791." The Astrophysical Journal, Vol. 796, No. 1 (Nov., 2014): 68.en_US
dc.identifier.doi10.1088/0004-637x/796/1/68en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34678
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: generalen_US
dc.subjectopen clusters and associations: generalen_US
dc.subjectopen clusters and associations: individual (ngc 6791)en_US
dc.subjectstars: abundancesen_US
dc.subjecteffective temperature scaleen_US
dc.subjecthorizontal-branch starsen_US
dc.subjectrich open clusteren_US
dc.subjectred giant branchen_US
dc.subjectmetal-poor starsen_US
dc.subjectglobular-clustersen_US
dc.subjectabundanceen_US
dc.subjectvariationsen_US
dc.subjectmain-sequenceen_US
dc.subjectnitrogen abundanceen_US
dc.subjecthelium contenten_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSearching For Chemical Signatures Of Multiple Stellar Populations In The Old, Massive Open Cluster NGC 6791en_US
dc.typeArticleen_US

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