The Two Metallicity Groups Of The Globular Cluster M22: A Chemical Perspective
dc.contributor.utaustinauthor | Sneden, Christopher | en_US |
dc.creator | Marino, A. F. | en_US |
dc.creator | Sneden, Christopher | en_US |
dc.creator | Kraft, R. P. | en_US |
dc.creator | Wallerstein, G. | en_US |
dc.creator | Norris, J. E. | en_US |
dc.creator | Da Costa, G. | en_US |
dc.creator | Milone, A. P. | en_US |
dc.creator | Ivans,, II | en_US |
dc.creator | Gonzalez, G. | en_US |
dc.creator | Fulbright, J. P. | en_US |
dc.creator | Hilker, M. | en_US |
dc.creator | Piotto, G. | en_US |
dc.creator | Zoccali, M. | en_US |
dc.creator | Stetson, P. B. | en_US |
dc.date.accessioned | 2016-04-22T19:47:16Z | |
dc.date.available | 2016-04-22T19:47:16Z | |
dc.date.issued | 2011-08 | en |
dc.description.abstract | We present a detailed chemical composition analysis of 35 red giant stars in the globular cluster M22. High resolution spectra for this study were obtained at five observatories, and analyzed in a uniform manner. We have determined abundances of representative light proton-capture, alpha, Fe-peak and neutron-capture element groups. Our aim is to better understand the peculiar chemical enrichment history of this cluster, in which two stellar groups are characterized by a different content in iron, neutron capture elements Y, Zr and Ba, and alpha element Ca. The principal results of this study are: (i) substantial star-to-star metallicity scatter (-2.0 less than or similar to [Fe/H] less than or similar to -1.6); (ii) enhancement of s-process/r-process neutron-capture abundance ratios in a fraction of giants, positively correlated with metallicity; (iii) sharp separation between the s-process-rich and s-process-poor groups by [La/Eu] ratio; (iv) possible increase of [Cu/Fe] ratios with increasing [Fe/H], suggesting that this element also has a significant s-process component; and (v) presence of Na-O and C-N anticorrelations in both the stellar groups. | en_US |
dc.description.department | Astronomy | en_US |
dc.description.sponsorship | National Aeronautics and Space Administration | en_US |
dc.description.sponsorship | National Science Foundation | en_US |
dc.description.sponsorship | Canadian Space Agency | en_US |
dc.description.sponsorship | Fondecyt Regular 1085278 | en_US |
dc.description.sponsorship | Mideplan Milky Way Millennium Nucleus P07-021-F | en_US |
dc.description.sponsorship | US National Science Foundation AST 09-08978 Australian Research Council DP0984924 20075TP5K9 | en_US |
dc.identifier | doi:10.15781/T2CN5X | |
dc.identifier.citation | Marino, A. F., Christopher Sneden, R. P. Kraft, G. Wallerstein, J. E. Norris, G. Da Costa, A. P. Milone et al. >The two metallicity groups of the globular cluster M 22: a chemical perspective.> Astronomy & Astrophysics, Vol. 532 (Aug., 2011): A8. | en_US |
dc.identifier.doi | 10.1051/0004-6361/201116546 | en_US |
dc.identifier.issn | 0004-6361 | en_US |
dc.identifier.uri | http://hdl.handle.net/2152/34483 | |
dc.language.iso | English | en_US |
dc.relation.ispartofserial | Astronomy & Astrophysics | en_US |
dc.rights | Administrative 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.subject | techniques: spectroscopic | en_US |
dc.subject | stars: abundances | en_US |
dc.subject | stars: population ii | en_US |
dc.subject | globular clusters: individual: m 22 (ngc 6656) | en_US |
dc.subject | multiple stellar populations | en_US |
dc.subject | star abundance variations | en_US |
dc.subject | s-process | en_US |
dc.subject | nucleosynthesis | en_US |
dc.subject | neutron-capture elements | en_US |
dc.subject | double subgiant branch | en_US |
dc.subject | centauri ngc 5139 | en_US |
dc.subject | red giant branch | en_US |
dc.subject | metal-poor stars | en_US |
dc.subject | omega-centauri | en_US |
dc.subject | massive stars | en_US |
dc.subject | astronomy & astrophysics | en_US |
dc.title | The Two Metallicity Groups Of The Globular Cluster M22: A Chemical Perspective | en_US |
dc.type | Article | en_US |
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