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          Institute: MPI für Astrophysik     Collection: Stellar Astrophysics     Display Documents



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ID: 10387.0, MPI für Astrophysik / Stellar Astrophysics
First full evolutionary computation of the helium flash-induced mixing in population II stars
Authors:Cassisi, S.; Schlattl, H.; Salaris, M.; Weiss, A.
Language:English
Date of Publication (YYYY-MM-DD):2003-01-01
Title of Journal:The Astrophysical Journal
Journal Abbrev.:Astrophys. J.
Volume:582
Issue / Number:1
Start Page:L43
End Page:L46
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The core helium flash in low-mass stars with extreme mass loss occurs after the tip of the red giant branch, when the H-rich envelope is very thin. The low efficiency of the H-shell source enables the He flash-driven convective zone to penetrate H-rich layers and trigger a thermonuclear runaway, resulting in a subsequent surface enrichment with He and C. In this Letter, we present the first full computations of Population II low-mass stellar models through this phase. Models experiencing this dredge-up event are significantly hotter than their counterparts with H-rich envelopes, which makes them promising candidates for explaining the existence of stars observed beyond the canonical blue end of the horizontal branch ("blue hook stars"). Moreover, this temperature difference could explain the observed gap in M-v between extreme blue horizontal-branch and blue hook stars. A first comparison with spectroscopic observations of blue hook stars in the globular cluster omega Cen is also presented.
Free Keywords:stars : abundances; stars : evolution; stars : horizontal- branch; stars : late-type
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
External Affiliations:INAF, Osservatorio Astron Collurania, Via M Maggini, I-64100; Teramo, Italy; INAF, Osservatorio Astron Collurania, I-64100 Teramo, Italy; Max Planck Inst Astrophys, D-85748 Garching, Germany; Liverpool John Moores Univ, Astrophys Res Inst, Birkenhead CH41 1LD, Merseyside, England
Identifiers:ISI:000180000700009
ISSN:0004-637X
URL:http://www.journals.uchicago.edu/ApJ/journal/issue...
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