2007ApJ...661L..53P

Query : 2007ApJ...661L..53P

2007ApJ...661L..53P - Astrophys. J., 661, L53-L56 (2007/May-3)

A triple main sequence in the globular cluster NGC 2808.

PIOTTO G., BEDIN L.R., ANDERSON J., KING I.R., CASSISI S., MILONE A.P., VILLANOVA S., PIETRINFERNI A. and RENZINI A.

Abstract (from CDS):

Accurate photometry with HST's ACS shows that the main sequence (MS) of the globular cluster NGC 2808 splits into three separate branches. The three MS branches may be associated with the complexities of the cluster's horizontal branch and of its abundance distribution. We attribute the MS branches to successive rounds of star formation, with different helium abundances; we discuss possible sources of helium enrichment. Some other massive globulars also appear to have complex populations; we compare them with NGC 2808.

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Journal keyword(s): Galaxy: Globular Clusters: Individual: NGC Number: NGC 2808 - Stars: Hertzsprung-Russell Diagram

Simbad objects: 4

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Number of rows : 4
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 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1540 0
2 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
3 NGC 6388 GlC 17 36 17.461 -44 44 08.34           ~ 988 1
4 NGC 6441 GlC 17 50 13.06 -37 03 05.2           ~ 940 0

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