2006ApJ...652.1240K

Query : 2006ApJ...652.1240K

2006ApJ...652.1240K - Astrophys. J., 652, 1240-1245 (2006/December-1)

The chemical evolution of helium in globular clusters: implications for the self-pollution scenario.

KARAKAS A.I., FENNER Y., SILLS A., CAMPBELL S.W. and LATTANZIO J.C.

Abstract (from CDS):

We investigate the suggestion that there are stellar populations in some globular clusters with enhanced helium (Y∼0.28-0.40) compared to the primordial value. We assume that a previous generation of massive asymptotic giant branch (AGB) stars have polluted the cluster. Two independent sets of AGB yields are used to follow the evolution of helium and CNO using a Salpeter initial mass function (IMF) and two top-heavy IMFs. In no case are we able to produce the postulated large Y∼0.35 without violating the observational constraint that the CNO content is nearly constant.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Globular Clusters: General - Stars: Abundances - Stars: AGB and Post-AGB - Stars: Chemically Peculiar

Simbad objects: 9

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Number of rows : 9
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 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 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 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
5 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
6 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
7 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
8 M 71 GlC 19 53 46.49 +18 46 45.1           ~ 1190 0
9 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0

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