The ACS survey of galactic globular clusters. III. The double subgiant branch of NGC 1851

A. P. Milone, L. R. Bedin, G. Piotto, J. Anderson, I. R. King, A. Sarajedini, A. Dotter, B. Chaboyer, A. Marín-Franch, S. Majewski, A. Aparicio, M. Hempel, N. E.Q. Paust, I. N. Reid, A. Rosenberg, M. Siegel

Research output: Contribution to journalArticlepeer-review

236 Scopus citations

Abstract

Photometry with the Hubble Space Telescope Advanced Camera for Surveys (HSTACS) 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.

Original languageEnglish (US)
Pages (from-to)241-250
Number of pages10
JournalAstrophysical Journal
Volume673
Issue number1
DOIs
StatePublished - Jan 20 2008

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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