The ACS Survey of Galactic Globular Clusters. III. The Double Subgiant Branch of NGC 1851

Bibcode
2008ApJ...673..241M
DOI
10.1086/524188
Milone, A. P.; Bedin, L. R.; Piotto, G.; Anderson, J.; King, I. R.; Sarajedini, A.; Dotter, A.; Chaboyer, B.; Marín-Franch, A.; Majewski, S.; Aparicio, A.; Hempel, M.; Paust, N. E. Q.; Reid, I. N.; Rosenberg, A.; Siegel, M.
Bibliographical reference

The Astrophysical Journal, Volume 673, Issue 1, pp. 241-250.

Advertised on:
1
2008
Journal
The Astrophysical Journal
Number of authors
16
IAC number of authors
3
Citations
265
Refereed citations
225
Description
Photometry with the Hubble Space Telescope Advanced Camera for Surveys (HST 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 ~1 Gyr. We discuss other anomalies in NGC 1851 that 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. Based on observations with the NASA/ESA Hubble Space Telescope under the programs GO-10775 and GO-5696, obtained at the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.
Related projects
NGC 2808 Globular Cluster
Milky Way and Nearby Galaxies

The general aim of the project is to research the structure, evolutionary history and formation of galaxies through the study of their resolved stellar populations, both from photometry and spectroscopy. The group research concentrates in the most nearby objects, namely the Local Group galaxies including the Milky Way and M33 under the hypothesis

Martín
López Corredoira
Closed
Type
Refereed
The Milky Way and the Local Group (MWLG)

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