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1999A&A...343..904C - Astronomy and Astrophysics, volume 343, 904-908 (1999/3-3)
On the gap in horizontal branches at B-V about zero.
CALOI V.
Abstract (from CDS):
It is proposed that the gap observed in the horizontal branch sequence of many globular clusters at B-V about zero is due to a surface phenomenon. Stars on the hotter side of the gap - Teff>10000K - have an atmospheric chemical composition altered as in peculiar A and B stars. The appearance of a convective regime in the surface layers at the temperature and gravity of the gap cancel the peculiarities: it is proposed that the ensuing changes in surface physical conditions give origin to the observed gap.
Abstract Copyright: ∼
Journal keyword(s): Galaxy: globular clusters: general - stars: horizontal-branch - stars: chemically peculiar
Simbad objects: 16
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