Exploring Anticorrelations And Light Element Variations In Northern Globular Clusters Observed By The APOGEE Survey

dc.contributor.utaustinauthorShetrone, Matthew D.en_US
dc.creatorMeszaros, Szabolcs.en_US
dc.creatorMartell, Sarah L.en_US
dc.creatorShetrone, Matthewen_US
dc.creatorLucatello, Saraen_US
dc.creatorTroup, Nicholas W.en_US
dc.creatorBovy, Joen_US
dc.creatorCunha, Katiaen_US
dc.creatorGarcia-Hernandez, Domingo A.en_US
dc.creatorOverbeek, Jamie C.en_US
dc.creatorPrieto, Carlos Allendeen_US
dc.creatorBeers, Timothy C.en_US
dc.creatorFrinchaboy, Peter M.en_US
dc.creatorPerez, Ana E. Garciaen_US
dc.creatorHearty, Fred R.en_US
dc.creatorHoltzman, Jonen_US
dc.creatorMajewski, Steven R.en_US
dc.creatorNidever, David L.en_US
dc.creatorSchiavon, Ricardo P.en_US
dc.creatorSchneider, Donald P.en_US
dc.creatorSobeck, Jennifer S.en_US
dc.creatorSmith, Verne V.en_US
dc.creatorZamora, Olgaen_US
dc.creatorZasowski, Gailen_US
dc.description.abstractWe investigate the light-element behavior of red giant stars in northern globular clusters (GCs) observed by the SDSS-III Apache Point Observatory Galactic Evolution Experiment. We derive abundances of 9 elements (Fe, C, N, O, Mg, Al, Si, Ca, and Ti) for 428 red giant stars in 10 GCs. The intrinsic abundance range relative to measurement errors is examined, and the well-known C-N and Mg-Al anticorrelations are explored using an extreme-deconvolution code for the first time in a consistent way. We find that Mg and Al drive the population membership in most clusters, except in M107 and M71, the two most metal-rich clusters in our study, where the grouping is most sensitive to N. We also find a diversity in the abundance distributions, with some clusters exhibiting clear abundance bimodalities (for example M3 and M53) while others show extended distributions. The spread of Al abundances increases significantly as cluster average metallicity decreases as previously found by other works, which we take as evidence that low metallicity, intermediate mass AGB polluters were more common in the more metal-poor clusters. The statistically significant correlation of [Al/Fe] with [Si/Fe] in M15 suggests that Si-28 leakage has occurred in this cluster. We also present C, N, and O abundances for stars cooler than 4500 K and examine the behavior of A(C+N+O) in each cluster as a function of temperature and [Al/Fe]. The scatter of A(C+N+O) is close to its estimated uncertainty in all clusters and independent of stellar temperature. A(C+N+O) exhibits small correlations and anticorrelations with [Al/Fe] in M3 and M13, but we cannot be certain about these relations given the size of our abundance uncertainties. Star-to-star variations of alpha-element (Si, Ca, Ti) abundances are comparable to our estimated errors in all clusters.en_US
dc.description.sponsorshipAustralian Research Council through DECRA Fellowship DE140100598en_US
dc.description.sponsorshipPRIN MIUR >Chemical and dynamical evolution of the Milky Way and Local Group Galaxies>en_US
dc.description.sponsorshipNASA through Hubble Fellowship from the Space Telescope Science Institute HST-HF-51285.01en_US
dc.description.sponsorshipNASA NAS5-26555en_US
dc.description.sponsorshipPhysics Frontier Center/Joint Institute or Nuclear Astrophysics (JINA) PHY 14-30152en_US
dc.description.sponsorshipPhysics Frontier Center/JINA Center for the Evolution of the Elements (JINA-CEE)en_US
dc.description.sponsorshipNational Science Foundation AST-0907873, AST-1109888en_US
dc.description.sponsorshipSpanish Ministry of Economy and Competitiveness AYA-2011-27754en_US
dc.description.sponsorshipAlfred P. Sloan Foundationen_US
dc.description.sponsorshipU.S. Department of Energy Office of Science PHY 08-22648en_US
dc.identifier.citationMészáros, Szabolcs, Sarah L. Martell, Matthew Shetrone, Sara Lucatello, Nicholas W. Troup, Jo Bovy, Katia Cunha et al. >Exploring Anticorrelations and Light Element Variations in Northern Globular Clusters Observed by the APOGEE Survey.> The Astronomical Journal, Vol. 149, No. 5. (May., 2015)en_US
dc.relation.ispartofserialAstronomical 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.subjectstars: abundancesen_US
dc.subjectstars: agb and post-agben_US
dc.subjectstars: chemically peculiaren_US
dc.subjectstars: evolutionen_US
dc.subjectred giant branchen_US
dc.subjectgalactic evolution experimenten_US
dc.subjectstar abundanceen_US
dc.subjectdouble subgiant branchen_US
dc.subjectmain-sequence starsen_US
dc.subjectdigital skyen_US
dc.subjectpoor halo fielden_US
dc.subjectbright giantsen_US
dc.subjectmultiple populationsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleExploring Anticorrelations And Light Element Variations In Northern Globular Clusters Observed By The APOGEE Surveyen_US

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