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http://hdl.handle.net/20.500.12386/23279
Title: | The normal chemistry of multiple stellar populations in the dense globular cluster NGC 6093 (M 80) | Authors: | CARRETTA, Eugenio BRAGAGLIA, Angela GRATTON, Raffaele D'ORAZI, VALENTINA LUCATELLO, Sara SOLLIMA, ANTONIO LUIGI AL MOMANY, YAZAN CATANZARO, Giovanni LEONE, FRANCESCO |
Issue Date: | 2015 | Journal: | ASTRONOMY & ASTROPHYSICS | Number: | 578 | First Page: | A116 | Abstract: | We present the abundance analysis of 82 red giant branch stars in the dense, metal-poor globular cluster NGC 6093 (M 80), the largest sample of stars analysed in this way for this cluster. From high-resolution UVES spectra of 14 stars and intermediate resolution GIRAFFE spectra for the other stars we derived abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Y, Zr, Ba, La, Ce, Pr, Nd, Sm, Eu. On our UVES metallicity scale the mean metal abundance of M 80 is [Fe/H] = -1.791 ± 0.006 ± 0.076 (±statistical ±systematic error) with σ = 0.023 (14 stars). M 80 shows star-to-star variations in proton-capture elements, and the extension of the Na-O anti-correlation perfectly fit the relations with (i) total cluster mass; (ii) horizontal branch morphology; and (iii) cluster concentration previously found by our group. The chemistry of multiple stellar populations in M 80 does not look extreme. The cluster is also a representative of halo globular clusters concerning the pattern of α-capture and Fe-group elements. However we found that a significant contribution from the s-process is required to account for the distribution of neutron-capture elements. A minority of stars in M 80 seem to exhibit slightly enhanced abundances of s-process species, compatible with those observed in M 22 and NGC 1851, although further confirmation from larger samples is required. <P />Based on observations collected at ESO telescopes under programme 083.D-0208.Full Tables 2, 3, 5-9 are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A116">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/578/A116</A>Appendix A is available in electronic form at <A href="http://www.aanda.org/10.1051/0004-6361/201525951/olm">http://www.aanda.org</A> | Acknowledgments: | This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This research has been funded by PRIN INAF 2011 “Multiple populations in globular clusters: their role in the Galaxy assembly” (PI E. Carretta), and PRIN MIUR 2010-2011, project “The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies” (PI F. Matteucci). This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France and of NASA’s Astrophysical Data System. | URI: | http://hdl.handle.net/20.500.12386/23279 | URL: | https://www.aanda.org/articles/aa/abs/2015/06/aa25951-15/aa25951-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201525951 | Bibcode ADS: | 2015A&A...578A.116C | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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156_carretta_m80_nao_2015.pdf | pdf editoriale | 1.37 MB | Adobe PDF | View/Open |
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