Hostname: page-component-76fb5796d-x4r87 Total loading time: 0 Render date: 2024-04-25T13:15:05.217Z Has data issue: false hasContentIssue false
  • English
  • Français

Are Galactic globular cluster AGB stars rich or poor in Sodium? Sodium abundance of AGB and RGB stars in NGC 2808

Published online by Cambridge University Press:  31 March 2017

Yue Wang ,
Francesca Primas ,
Corinne Charbonnel ,
Mathieu Van der Swaelmen ,
William Chantereau  and
Giuseppe Bono
Yue Wang
Affiliation:
European Southern Observatory, Garching, Germany Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, China (email: ywang@nao.cas.cn)
Francesca Primas
Affiliation:
European Southern Observatory, Garching, Germany
Corinne Charbonnel
Affiliation:
Department of Astronomy, University of Geneva, Switzerland CNRS UMR 5277 IRAP & Université de Toulouse, France
Mathieu Van der Swaelmen
Affiliation:
Observatoire de la Côte d’Azur, CNRS UMR 7293, BP4229, Nice, France
William Chantereau
Affiliation:
Department of Astronomy, University of Geneva, Switzerland
Giuseppe Bono
Affiliation:
Dipartimento di Fisica, Universit á di Roma Tor Vergata, Rome, Italy
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

A spectroscopic study comparing the [Na/Fe] distributions of RGB and AGB stars in the Galactic globular cluster (GC) NGC 6752 found that there was no Na-rich, 2nd-generation star along the early-AGB of this cluster. This came as a surprise since in this GC, as well as other Galactic GCs studied so far, 1st- and 2nd-generation stars have usually been found from the main sequence turnoff up to the red giant branch. To investigate whether the failure of a significant fraction of stars to ascend the AGB also happens to other GCs, we studied a sample of AGB and RGB stars in NGC 2808 observed at the ESO/VLT with FLAMES. Contrary to NGC 6752, we find that the AGB and RGB stars we studied in NGC 2808 have comparable [Na/Fe] dispersions.

Keywords

globular clusterabundancesAGB star
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S316: Formation, evolution, and survival of massive star clusters , August 2015 , pp. 361 - 362
Copyright
Copyright © International Astronomical Union 2017 

References

Bergemann, M., Lind, K., Collet, R., Magic, Z., & Asplund, M. 2012, MNRAS, 427, 27 CrossRefGoogle Scholar
Campbell, S. W., D'Orazi, V., Yong, D., Constantino, T. N., et al. 2013, Nature, 498, 198 CrossRefGoogle Scholar
Carretta, E., Bragaglia, A., Gratton, R. G., Leone, F., et al. 2006, A&A, 450, 523 Google Scholar
Carretta, E., Bragaglia, A., Gratton, R. G., Lucatello, S., et al. 2009, A&A, 505, 117 Google Scholar
Cordero, M. J., Pilachowski, C. A., Johnson, C. I., McDonald, I., et al. 2014, ApJ, 780, 94 CrossRefGoogle Scholar
Johnson, C. I., McDonald, I., Pilachowski, C. A., Mateo, M., et al. 2015, AJ, 149, 71 CrossRefGoogle Scholar
Lind, K., Asplund, M., Barklem, P. S., & Belyaev, A. K. 2011, A&A, 528, A103 Google Scholar
Lind, K., Bergemann, M., & Asplund, M. 2012, MNRAS, 427, 50 CrossRefGoogle Scholar