Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...612l..25n&link_type=abstract
The Astrophysical Journal, Volume 612, Issue 1, pp. L25-L28.
Astronomy and Astrophysics
Astronomy
187
Galaxy: Globular Clusters: Individual: Name: Ω Centauri, Stars: Abundances, Stars: Evolution, Stars: Population Ii
Scientific paper
Recent Hubble Space Telescope color magnitude diagrams (CMDs) of ω 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 ΔY~0.12, 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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