2008A&A...479..805V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:01:19

2008A&A...479..805V - Astronomy and Astrophysics, volume 479, 805-816 (2008/3-1)

The self-enrichment scenario in intermediate metallicity globular clusters.

VENTURA P. and D'ANTONA F.

Abstract (from CDS):

We present stellar yields computed from detailed models of intermediate mass asymptotic giant branch stars of low metallicity. In this work, all the main microphysics inputs have been updated, and in particular α-enhancement is explicitly taken into account in both the opacities and equation of state. The target of this work is to provide a basis for testing the reliability of the AGB self-enrichment scenario for globular clusters of intermediate metallicity. These globular clusters exhibit well-defined abundance patterns, which have often been interpreted as the consequence of the pollution of the interstellar medium by the ejecta of massive AGBs. We calculated a grid of intermediate-mass models with metallicity Z=0.001; the evolutionary sequences are followed from the pre-main sequence throughout the whole AGB phase. We focus our attention on those elements widely studied in the spectroscopic investigations of globular clusters stars, i.e. oxygen, sodium, aluminium, magnesium, and fluorine. The predictions of our models show an encouraging agreement with the demand of the self-enrichment scenario for what concerns the abundances of oxygen, aluminium, fluorine, and magnesium. The question of sodium is more tricky, due to the large uncertainties of the cross-sections of the Ne-Na cycle. The present results show that only a relatively narrow range of initial masses (M=5,6M) can be responsible for the self enrichment.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: evolution - stars: chemically peculiar - globular clusters: general

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5669 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14832 1
3 IRAS 09110-6439 GlC 09 12 03.10 -64 51 48.6   7.77 5.69     ~ 1245 0
4 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
5 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2266 0
6 M 5 GlC 15 18 33.22 +02 04 51.7   7.34 5.95     ~ 1771 0
7 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1677 0
8 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2007 0
9 M 12 GlC 16 47 14.18 -01 56 54.7   8.52 6.07     ~ 579 0
10 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1807 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:01:19

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