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
274
Refereed citations
233
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
Superposition of model of long-bar+3-kpc arm of López-Corredoira et al. (2026, A&A 708, A288) with the artistic representation of the annotated ‘Road Map to the Milky Way’ by NASA/JPL-Caltech/R. Hurt (SSC/Caltech) based on NASA’s Spitzer Space Telescope achievements.
Milky Way and Nearby Galaxies
The overall aim of the project is to study the morphology, stellar populations, kinematics and dynamics (including formation and evolution) of the Milky Way and its satellite galaxies and other Local Group galaxies. The project can be divided into two main lines: I. Structure of the Milky Way and nearby galaxies. The detailed study of the
Martín
López Corredoira
In progress
Type
Refereed
The Milky Way and the Local Group (MWLG)

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