Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-04T19:29:48.031Z Has data issue: false hasContentIssue false
  • English
  • Français

Multiple population theory: The extreme helium population problem

Published online by Cambridge University Press:  01 October 2008

Sukyoung K. Yi
Sukyoung K. Yi*
Affiliation:
Yonsei University, Department of Astronomy, Seoul 120-749, Korea email: [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.

The spreads in chemical abundances inferred by recent precision observations suggest that some or possibly all globular clusters can no longer be considered as simple stellar populations. The most striking case is ω Cen in the sense that its bluest main-sequence, despite its high metallicity, demands an extreme helium abundance of Y ≈ 0.4. I focus on this issue of “the extreme helium population problem” in this review.

Keywords

stars: abundancesAGB and post-AGBchemically peculiarevolution Hertzsprung-Russell diagramPopulation IIGalaxy: generalabundancesglobular clustersISM: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S258: The Ages of Stars , October 2008 , pp. 253 - 264
Copyright
Copyright © International Astronomical Union 2009

References

Bedin, L. R., Piotto, G., Anderson, J., Cassisi, S., King, I. R., Momany, Y., & Carraro, G. 2004, ApJ, 605, L125CrossRefGoogle Scholar
Bekki, K., Campbell, S. W., Lattanzio, J. C. & Norris, J. E., 2007, MNRAS, 337, 335CrossRefGoogle Scholar
Choi, E. & Yi, S. K. 2007, MNRAS, 375, L1CrossRefGoogle Scholar
Choi, E. & Yi, S. K. 2008, MNRAS, 386, 1332CrossRefGoogle Scholar
Chuzhoy, L. 2006, MNRAS, 369, L52CrossRefGoogle Scholar
D'Antona, F., Bellazzini, M., Caloi, V., Pecci, F. F., Galleti, S., & Rood, R. T. 2005, ApJ, 631, 868CrossRefGoogle Scholar
Decressin, T., Charbonnel, C., & Meynet, G. 2007, A&A, 475, 859Google Scholar
Decressin, T., Baumgardt, H., & Kroupa, P. 2008, A&A, in pressGoogle Scholar
Fall, S. M. & Zhang, Q. 2001, ApJ, 561, 751CrossRefGoogle Scholar
Izzard, R. G., Tout, C. A., Karakas, A., & Pols, O. R. 2004, MNRAS, 350, 407CrossRefGoogle Scholar
Karakas, A. I., Fenner, Y., Sills, A., Campbell, S. W., & Lattanzio, J. C. 2006, ApJ, 652, 1240CrossRefGoogle Scholar
Kaviraj, S., Sohn, S. T., O'Connell, R. W., Yoon, S.-J, Lee, Y.-W., & Yi, S. K. 2007, MNRAS, 377, 987CrossRefGoogle Scholar
Lee, Y.-W., Joo, J.-M., Sohn, Y.-J., Rey, S.-C., Lee, H.-C., & Walker, A. R. 1999, Nature, 402, 55CrossRefGoogle Scholar
Lee, Y.-W., Joo, S.-J., Han, S.-I., Chung, C., Ree, C. H., Sohn, Y.-J., Kim, Y.-C., Yoon, S.-J., Yi, S. K., & Demarque, P. 2005, ApJ, 621, L57CrossRefGoogle Scholar
Lee, Y.-W., Gim, H. B., & Casetti-Dinescu, D. I. 2007, ApJ, 661, L49CrossRefGoogle Scholar
Maeder, A. 1992, A&A, 264, 105Google Scholar
Maeder, A. & Meynet, G. 2001, A&A, 373, 555Google Scholar
Maeder, A. & Meynet, G. 2006, A&A, 448, L37Google Scholar
Newsham, G. & Terndrop, D. M. 2007, ApJ, 664, 332CrossRefGoogle Scholar
Norris, J. E. 2004, ApJ, 612, 25CrossRefGoogle Scholar
Piotto, et al. 2005, ApJ, 621, 777CrossRefGoogle Scholar
Piotto, G., Bedin, L. R., Anderson, J., King, I. R., Cassisi, S., Milone, A. P., Villanova, S., Pietrinferni, A., & Renzini, A. 2007, ApJ, 661, 53CrossRefGoogle Scholar
Recio-Blanco, A., Aparicio, A., Piotto, G., de Angeli, F., & Djorgovski, S. G. 2006, A&A, 452, 875Google Scholar
Renzini, A. 2008, MNRAS, 391, 354CrossRefGoogle Scholar
Siess, L. 2007, A&A, 476, 893Google Scholar
Smecker-Hane, T. A., Stetson, P. B., Hesser, J. E., & Lehnert, M. D. 1994, AJ, 108, 507CrossRefGoogle Scholar
Sohn, S. T., O'Connell, R. W., Jundu, A., Landsman, W. B., Burstein, D., Bohlin, R. C., Frogel, J. A., & Rose, J. A. 2006, AJ, 131, 866CrossRefGoogle Scholar
Sollima, A., Ferraro, F. R., Ballazzini, M., Origlia, L., Straniero, O., & Pancino, E. 2007, ApJ, 654, 915CrossRefGoogle Scholar
Stanford, L. M., Da Costa, G. S., Norris, J. E., & Cannon, R. D. 2007, ApJ, 667, 911CrossRefGoogle Scholar
Tsujimoto, T., Shigeyama, T., & Suda, T. 2007, ApJ, 654, 139CrossRefGoogle Scholar
Villanova, S., Piotto, G., King, I. R., Anderson, J., Bedin, L. R., Gratton, R. G., Cassisi, S., Momany, Y., Bellini, A., Cool, A. M.Recio-Blanco, A., & Renzini, A. 2007, ApJ, 663, 296CrossRefGoogle Scholar
Yi, S. 2003, ApJ, 582, 202CrossRefGoogle Scholar