Multiple stellar populations in the Galactic globular cluster NGC 6752

Abstract

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.

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

References in corpus (12)

• Fast rotating massive stars and the origin of the abundance patterns in galactic globular clusters
• Spectroscopic and Photometric evidence of two stellar populations in the Galactic Globular Cluster NGC6121 (M4)
• The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851
• Origin of multiple stellar populations in globular clusters and their helium enrichment
• Multiple stellar populations in three rich Large Magellanic Cloud star clusters
• The double Subgiant Branch of NGC 1851: the role of the CNO abundance
• An abundance analysis of bright giants in the globular cluster NGC 1851
• The fraction of binary systems in the core of thirteen low-density Galactic globular clusters
• Nitrogen abundances in giant stars of the globular cluster NGC 6752
• A large C+N+O abundance spread in giant stars of the globular cluster NGC 1851
• Na-O Anticorrelation and HB. II. The Na-O anticorrelation in the globular cluster NGC 6752
• MCAO near-IR photometry of the Globular Cluster NGC 6388: MAD observations in crowded fields

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• Stellar Models of Multiple Populations in Globular Clusters. I. The Main Sequence of NGC 6752
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• The HST Large Programme on NGC6752. II. Multiple populations at the bottom of the main sequence probed in NIR
• Combined Effects of Binaries and Stellar Rotation on the Color-Magnitude Diagrams of Intermediate-Age Star Clusters
• The Hubble Space Telescope UV Legacy Survey of Galactic Globular Clusters. VIII. Preliminary Public Catalog Release
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• The Swift UVOT Stars Survey: I. Methods and Test Clusters
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