2008ApJ...673..241M

Query : 2008ApJ...673..241M

2008ApJ...673..241M - Astrophys. J., 673, 241-250 (2008/January-3)

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

MILONE A.P., BEDIN L.R., PIOTTO G., ANDERSON J., KING I.R., SARAJEDINI A., DOTTER A., CHABOYER B., MARIN-FRANCH A., MAJEWSKI S., APARICIO A., HEMPEL M., PAUST N.E.Q., REID I.N., ROSENBERG A. and SIEGEL M.

Abstract (from CDS):

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.

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Journal keyword(s): Galaxy: Globular Clusters: Individual: NGC Number: NGC 1851 - Stars: Hertzsprung-Russell Diagram

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
2 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
3 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
4 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
5 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0
6 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
7 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2

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