Multiple stellar populations in the Galactic globular cluster NGC 6752

Details Multiple stellar populations in the Galactic globular cluster NGC 6752 Multiple stellar populations in the Galactic globular cluster NGC 6752

2009-12-10

arxiv.org/abs/0912.2055v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

31 pages, 12 figures; Accepted for Publication in the Astrophysical Journal

Scientific paper

We have carried out high-precision photometry on a large number of archival HST images of the Galactic globular cluster NGC 6752, to search for signs of multiple stellar populations. We find a broadened main sequence, and demonstrate that this broadening cannot be attributed either to binaries or to photometric errors. There is also some indication of a main-sequence split. No significant spread could be found along the subgiant branch, however. Ground-based photometry reveals that in the U vs. (U-B) color-magnitude diagram the red-giant branch exhibits a clear color spread, which we have been able to correlate with variations in Na and O abundances. In particular the Na-rich, O-poor stars identified by Carretta et al. (2007) define a sequence on the red side of the red-giant branch, while Na-poor, O-rich stars populate a bluer, more dispersed portion of the red-giant branch.

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