Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-11T07:04:41.122Z Has data issue: false hasContentIssue false
  • English
  • Français

To Be or Not to Be: EHB Stars and AGB Stars

Published online by Cambridge University Press:  30 December 2019

David A. Brown
David A. Brown*
Affiliation:
Specola Vaticana (Vatican Observatory), V-00120, Cittá del Vaticano, Vatican City State, Europe email: dbrown@specola.va
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 formation of EHB stars is linked to the lives of AGB stars by indications that such EHB/sdB stars might form in globular clusters with multiple populations linked to AGB evolution. Observations of massive globular clusters, such as ω-Centauri (Bedin et al.2004, Piotto et al.2005) suggest that single EHB stars might form from He-enhanced progenitors (D’Antona et al.2005, D’Antona & Caloi 2008, Lee et al.2005) in environments enriched by AGB ejecta. The studies conducted by Han et al. (2002), Han et al. (2003), and Han et al. (2007) have been able to provide a strong case for the binary formation of EHB/sdB stars in the Galactic field, though binary formation channels in globular clusters is uncertain. Simulations presented here are an extension of the simulations of Han et al. (2002) and Han et al. (2003), for low metallicities to examine the binary EHB population in globular clusters.

Keywords

EHBAGBhelium-enrichmentstar
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 357 - 359
Copyright
© International Astronomical Union 2019 

References

Bedin, L.R., Piotto, G., Anderson, J., Cassisi, S., King, I.R., Momany, Y., & Carraro, G. 2004, ApJ (Letters), 605, L125 Google Scholar
Carretta, E., Bragaglia, A., Gratton, R.G., Leone, F., Recio-Blanco, A., & Lucatello, S. 2006, A& A, 450, 523 Google Scholar
D’Antona, F., Bellazzini, M., Caloi, V., Pecci, F.F., Galleti, S., & Rood, R.T. 2005, ApJ, 631, 868 CrossRefGoogle Scholar
D’Antona, F., & Caloi, V. 2008, MNRAS, 390, 693 CrossRefGoogle Scholar
D’Cruz, N., Dorman, B., Rood, R., & OConnell, R. 1996, ApJ, 466, 359 CrossRefGoogle Scholar
Han, Z., Podsiadlowski, P., Maxted, P.F.L., Marsh, T.R., & Ivanova, N. 2002, MNRAS, 336, 449 CrossRefGoogle Scholar
Han, Z., Podsiadlowski, P., Maxted, P.F.L., & Marsh, T.R. 2003, MNRAS, 341, 669 CrossRefGoogle Scholar
Han, Z., Podsiadlowski, P., & Lynas-Gray, A.E. 2007, MNRAS, 380, 1098 CrossRefGoogle 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 (Letters), 621, L57 Google Scholar
Maxted, P.F.L., Heber, U., Marsh, T.R., & North, R.C. 2001, MNRAS, 326, 1391 CrossRefGoogle Scholar
Mengel, J., Norris, J., & Gross, P. 1976, ApJ, 204, 488 CrossRefGoogle Scholar
Moni Bidin, C., Villanova, S., Piotto, G., & Momany, Y. 2011, A&A, 528, A127 Google Scholar
Piotto, G., Villanova, S., Bedin, L.R., Gratton, R., Cassisi, S., Momany, Y., Recio-Blanco, A., Lucatello, S., Anderson, J., King, I.R., Pietrinferni, A., & Carraro, G. 2005, ApJ, 621, 777 CrossRefGoogle Scholar
Sweigart, A.V. 1997, ApJS 474, L23 CrossRefGoogle Scholar