Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-22
Astrophys.J. 582 (2003) L43-L46
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, uses emulateapj.sty; accepted for publication in ApJL
Scientific paper
10.1086/346200
The core helium-flash in low-mass stars with extreme mass loss occurs after the tip of the RGB, 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 work 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.
Cassisi Santi
Salaris Maurizio
Schlattl Helmut
Weiss Alexander
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