Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-24
Astronomy and Astrophysics
Astrophysics
22 pages, 7 figures, accepted for pubblication on ApJ
Scientific paper
10.1086/524188
Photometry with HST's ACS reveals that the subgiant branch (SGB) of the globular cluster NGC 1851 splits into two well-defined branches. If the split is due only to an age effect, the two SGBs would imply two star formation episodes separated by $\sim$ 1 Gyr. We discuss other anomalies in NGC 1851 which could be interpreted in terms of a double stellar population. Finally, we compare the case of NGC 1851 with the other two globulars known to host multiple stellar populations, and show that all three clusters differ in several important respects.
Anderson Jeffrey
Aparicio Antonio
Bedin Luigi R.
Chaboyer Brian
Dotter Aaron
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