期刊
ASTROPHYSICAL JOURNAL
卷 612, 期 1, 页码 L25-L28出版社
UNIV CHICAGO PRESS
DOI: 10.1086/423986
关键词
globular clusters : individual (omega Centauri); stars : abundances; stars : evolution; stars : Population II
Recent Hubble Space Telescope color magnitude diagrams (CMDs) of omega Centauri, which clearly show three sequences in the region of the main-sequence turnoff together with a double lower main sequence, are explained in terms of three populations having canonical heavy-element abundances ([Fe/H]=-1.7, -1.2, and -0.6), reasonable proportions and ages, but with surprising helium abundances. In particular, the CMD morphology of the second population ([Fe/H]=-1.2) is very well represented with a helium abundance much larger, by DeltaYsimilar to0.12, than that of the first ([Fe/H]=-1.7), which may hold the key to an understanding of the double lower main sequence.
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