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

doi:10.1086/524188

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

Astronomy & Astrophysics

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246 Citations (SciVal)

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 language	English (US)
Pages (from-to)	241-250
Number of pages	10
Journal	Astrophysical Journal
Volume	673
Issue number	1
DOIs	https://doi.org/10.1086/524188
State	Published - Jan 20 2008

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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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. (2008). The ACS survey of galactic globular clusters. III. The double subgiant branch of NGC 1851. Astrophysical Journal, 673(1), 241-250. https://doi.org/10.1086/524188

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title = "The ACS survey of galactic globular clusters. III. The double subgiant branch of NGC 1851",

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.",

author = "Milone, {A. P.} and Bedin, {L. R.} and G. Piotto and J. Anderson and King, {I. R.} and A. Sarajedini and A. Dotter and B. Chaboyer and A. Mar{\'i}n-Franch and S. Majewski and A. Aparicio and M. Hempel and Paust, {N. E.Q.} and Reid, {I. N.} and A. Rosenberg and M. Siegel",

year = "2008",

month = jan,

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doi = "10.1086/524188",

language = "English (US)",

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Milone, AP, Bedin, LR, Piotto, G, Anderson, J, King, IR, Sarajedini, A, Dotter, A, Chaboyer, B, Marín-Franch, A, Majewski, S, Aparicio, A, Hempel, M, Paust, NEQ, Reid, IN, Rosenberg, A & Siegel, M 2008, 'The ACS survey of galactic globular clusters. III. The double subgiant branch of NGC 1851', Astrophysical Journal, vol. 673, no. 1, pp. 241-250. https://doi.org/10.1086/524188

TY - JOUR

T1 - The ACS survey of galactic globular clusters. III. The double subgiant branch of NGC 1851

AU - Milone, A. P.

AU - Bedin, L. R.

AU - Piotto, G.

AU - Anderson, J.

AU - King, I. R.

AU - Sarajedini, A.

AU - Dotter, A.

AU - Chaboyer, B.

AU - Marín-Franch, A.

AU - Majewski, S.

AU - Aparicio, A.

AU - Hempel, M.

AU - Paust, N. E.Q.

AU - Reid, I. N.

AU - Rosenberg, A.

AU - Siegel, M.

PY - 2008/1/20

Y1 - 2008/1/20

N2 - 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.

AB - 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.

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

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