Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-28T01:34:35.350Z Has data issue: false hasContentIssue false
  • English
  • Français

Study of the Helium Enrichment in Globular Clusters

Published online by Cambridge University Press:  13 April 2010

Aldo A. R. Valcarce  and
Márcio Catelan
Aldo A. R. Valcarce
Affiliation:
Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile email: [email protected]; [email protected]
Márcio Catelan
Affiliation:
Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile email: [email protected]; [email protected]
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.

Globular clusters (GCs) are spheroidal concentrations typically containing of the order of 105 to 106, predominantly old, stars. Historically, they have been considered as the closest counterparts of the idealized concept of “simple stellar populations.” However, some recent observations suggest than, at least in some GCs, some stars are present that have been formed with material processed by a previous generation of stars. In this sense, it has also been suggested that such material might be enriched in helium, and that blue horizontal branch stars in some GCs should accordingly be the natural progeny of such helium-enhanced stars. In this contribution we show that, at least in the case of M3 (NGC 5272), the suggested level of helium enrichment is not supported by the available, high-precision observations.

Keywords

Hertzsprung-Russell diagramstars: abundancesstars: evolutionstars: horizontal-branchglobular clusters: generalglobular clusters: individual (M3 = NGC 5272)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 27 - 30
Copyright
Copyright © International Astronomical Union 2010

References

Anderson, J., Piotto, G., King, I. R., Bedin, L. R., & Guhathakurta, P. 2007, ApJ, 697, L58CrossRefGoogle Scholar
Caloi, V. & D'Antona, F. 2007, A&A, 463, 949Google Scholar
Carney, B. W. 1996, PASP, 108, 900CrossRefGoogle Scholar
Carreta, E. & Gratton, R. 1997, A&AS, 121, 95Google Scholar
Cassisi, S., Salaris, M., Pietrinferni, A., Piotto, G., Milone, A. P., Bedin, L. R., & Anderson, J. 2008 ApJ, 672, L115Google Scholar
Catelan, M., Borissova, J., Sweigart, A. V., & Spassova, N. 1998, ApJ, 494, 265Google Scholar
Catelan, M. & Cortés, C. 2008, ApJ, 676, L135Google Scholar
Catelan, M., Grundahl, F., Sweigart, A. V., Valcarce, A. A. R., & Cortés, C. 2009, ApJ, 695, L97Google Scholar
Clem, J. L., VandenBerg, D. A., Grundahl, F., & Bell, R. A. 2004, AJ, 127, 1227Google Scholar
D'Antona, F. & Caloi, V. 2008, MNRAS, 390, 693Google Scholar
Grundahl, F., Catelan, M., Landsman, W. B., Stetson, P. B., & Andersen, M. I. 1999, ApJ, 524, 242CrossRefGoogle Scholar
Grundahl, F., VandenBerg, D. A., & Andersen, M. I. 1998, ApJ, 500, L179CrossRefGoogle Scholar
Harris, W. E. 1996, AJ, 112, 1487Google Scholar
Marino, A. F., Milone, A. P., Piotto, G., Villanova, S., Bedin, L. R., Bellini, A., & Renzini, A. 2009, arXiv:0905.4058Google Scholar
Milone, M. H., et al. 2008, ApJ, 673, 241Google Scholar
Pietrinferni, A., Cassisi, S., Salaris, M., Percival, S., & Ferguson, J. W. 2009, ApJ, 697, 275CrossRefGoogle Scholar
Piotto, G., et al. 2005, ApJ, 621, 777CrossRefGoogle Scholar
Piotto, G., et al. 2007, ApJ, 661, L53Google Scholar
Piotto, G. 2008, MmSAI, 79, 334Google Scholar
Piotto, G., et al. 2009, in prep.Google Scholar
Salaris, M., Chieffi, A., & Straniero, O. 1993 ApJ, 414, 580Google Scholar
Siegel, M. H., et al. 2007, ApJ, 667, L57CrossRefGoogle Scholar
Sweigart, A. V. & Catelan, M. 1998 ApJ, 501, L63CrossRefGoogle Scholar
VandenBerg, D. A., Bergbusch, P. A., & Dowler, P. D. 2006, ApJS, 162, 375CrossRefGoogle Scholar
Villanova, S., et al. 2007, ApJ, 663, 296CrossRefGoogle Scholar
Zinn, R. & West, M. J. 1984, ApJS, 55, 45Google Scholar