A Triple Main Sequence in the Globular Cluster NGC 2808

Details A Triple Main Sequence in the Globular Cluster NGC 2808 A Triple Main Sequence in the Globular Cluster NGC 2808

2007-03-29

arxiv.org/abs/astro-ph/0703767v1

Astrophys.J.661:L53-L56,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, 1 table. Accepted for publication in ApJ Letter, on March 29 2007

Scientific paper

10.1086/518503

Accurate photometry with HST/ACS shows that the main sequence of the globular cluster NGC 2808 splits into three separate branches. The three MS branches may be associated with complexities of the cluster's horizontal branch and of its abundance distribution. We attribute the MS branches to successive rounds of star formation, with different helium abundances; we discuss possible sources of helium enrichment. Some other massive globulars also appear to have complex populations; we compare them with NGC 2808.

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