Searching For Multiple Stellar Populations In The Massive, Old Open Cluster Berkeley 39

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dc.contributor.utaustinauthorSneden, Christopheren_US
dc.creatorBragaglia, A.en_US
dc.creatorGratton, R. G.en_US
dc.creatorCarretta, E.en_US
dc.creatorD'Orazi, V.en_US
dc.creatorSneden, Christopheren_US
dc.creatorLucatello, S.en_US
dc.date.accessioned2016-04-22T19:44:56Z
dc.date.available2016-04-22T19:44:56Z
dc.date.issued2012-12en
dc.description.abstractThe most massive star clusters include several generations of stars with a different chemical composition (mainly revealed by an Na-O anti-correlation) while low-mass star clusters appear to be chemically homogeneous. We are investigating the chemical composition of several clusters with masses of a few 10(4) M-circle dot to establish the lower mass limit for the multiple stellar population phenomenon. Using VLT/FLAMES spectra we determine abundances of Fe, O, Na, and several other elements (a, Fe-peak, and neutron-capture elements) in the old open cluster Berkeley 39. This is a massive open cluster: M similar to 10(4) M-circle dot, approximately at the border between small globular clusters and large open clusters. Our sample size of about 30 stars is one of the largest studied for abundances in any open cluster to date, and will be useful to determine improved cluster parameters, such as age, distance, and reddening when coupled with precise, well-calibrated photometry. We find that Berkeley 39 is slightly metal-poor, <[Fe/H]> = -0.20, in agreement with previous studies of this cluster. More importantly, we do not detect any star-to-star variation in the abundances of Fe, O, and Na within quite stringent upper limits. The rms scatter is 0.04, 0.10, and 0.05 dex for Fe, O, and Na, respectively. This small spread can be entirely explained by the noise in the spectra and by uncertainties in the atmospheric parameters. We conclude that Berkeley 39 is a single-population cluster.en_US
dc.description.departmentAstronomyen_US
dc.identifierdoi:10.15781/T2GZ2T
dc.identifier.citationBragaglia, Angela, R. G. Gratton, Eugenio Carretta, Valentina D’Orazi, Christopher Sneden, and Sara Lucatello. >Searching for multiple stellar populations in the massive, old open cluster Berkeley 39.> Astronomy & Astrophysics, Vol. 548 (Dec., 2012): A122.en_US
dc.identifier.doi10.1051/0004-6361/201220366en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34366
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_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.subjectstars: abundancesen_US
dc.subjectopen clusters and associations: generalen_US
dc.subjectopenen_US
dc.subjectclusters and associations: individual: berkeley 39en_US
dc.subjectstars: atmospheresen_US
dc.subjectmetal-poor starsen_US
dc.subjectglobular-clustersen_US
dc.subjectmilky-wayen_US
dc.subjectred giantsen_US
dc.subjectabundanceen_US
dc.subjectvariationsen_US
dc.subjectlight-elementsen_US
dc.subjectevolutionen_US
dc.subjectratiosen_US
dc.subjectspectroscopyen_US
dc.subjectparametersen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSearching For Multiple Stellar Populations In The Massive, Old Open Cluster Berkeley 39en_US
dc.typeArticleen_US

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