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The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372

San Roman, I.; Munoz, C.; Geisler, D.; Villanova, S.; Kacharov, N.; Koch, A.; Carraro, G.; Tautvaisiene, G.; Vallenari, A. and Alfaro, E. J., et al. (2015) In Astronomy & Astrophysics 579.
Abstract
We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 +/- 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an a-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of... (More)
We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 +/- 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an a-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5 dex in Al abundances. Na is correlated with Al and Mg abundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified. (Less)
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keywords
globular clusters: individual: NGC 4372, stars: abundances
in
Astronomy & Astrophysics
volume
579
publisher
EDP Sciences
external identifiers
  • wos:000358877100018
  • scopus:84934938028
ISSN
0004-6361
DOI
10.1051/0004-6361/201525722
language
English
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yes
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b115c300-cc4a-49f0-ae9a-a3b4240337c9 (old id 7984939)
date added to LUP
2015-09-24 14:34:28
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2017-01-01 06:17:52
@article{b115c300-cc4a-49f0-ae9a-a3b4240337c9,
  abstract     = {We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 +/- 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an a-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5 dex in Al abundances. Na is correlated with Al and Mg abundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified.},
  articleno    = {A6},
  author       = {San Roman, I. and Munoz, C. and Geisler, D. and Villanova, S. and Kacharov, N. and Koch, A. and Carraro, G. and Tautvaisiene, G. and Vallenari, A. and Alfaro, E. J. and Bensby, Thomas and Flaccomio, E. and Francois, P. and Korn, A. J. and Pancino, E. and Recio-Blanco, A. and Smiljanic, R. and Bergemann, M. and Costado, M. T. and Damiani, F. and Heiter, U. and Hourihane, A. and Jofre, P. and Lardo, C. and de Laverny, P. and Masseron, T. and Morbidelli, L. and Sbordone, L. and Sousa, S. G. and Worley, C. C. and Zaggia, S.},
  issn         = {0004-6361},
  keyword      = {globular clusters: individual: NGC 4372,stars: abundances},
  language     = {eng},
  publisher    = {EDP Sciences},
  series       = {Astronomy & Astrophysics},
  title        = {The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372},
  url          = {http://dx.doi.org/10.1051/0004-6361/201525722},
  volume       = {579},
  year         = {2015},
}