On the gap in horizontal branches at B - V about zero

Details On the gap in horizontal branches at B - V about zero On the gap in horizontal branches at B - V about zero

Mar 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...343..904c&link_type=abstract

Astronomy and Astrophysics, v.343, p.904-908 (1999)

Astronomy and Astrophysics

Astrophysics

30

Galaxy: Globular Clusters: General, Stars: Horizontal-Branch, Stars: Chemically Peculiar

Scientific paper

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 - T_eff gtrsim 10000 K - 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.

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