Evolution of long-lived globular cluster stars Virtual Observatory Resource

Authors
  1. Chantereau W.
  2. Charbonnel C.
  3. Meynet G.
  4. Published by
    CDS
Abstract

Globular clusters host multiple populations of long-lived low-mass stars whose origin remains an open question. Several scenarios have been proposed to explain the associated photometric and spectroscopic peculiarities. They differ, for instance, in the maximum helium enrichment they predict for stars of the second population, which these stars can inherit at birth as the result of the internal pollution of the cluster by different types of stars of the first population. We present the distribution of helium-rich stars in present-day globular clusters as it is expected in the original framework of the fast-rotating massive stars scenario (FRMS) as first-population polluters. We focus on NGC 6752. We completed a grid of 330 stellar evolution models for globular cluster low-mass stars computed with different initial chemical compositions corresponding to the predictions of the original FRMS scenario for [Fe/H]=-1.75. Starting from the initial helium-sodium relation that allows reproducing the currently observed distribution of sodium in NGC 6752, we deduce the helium distribution expected in that cluster at ages equal to 9 and 13Gyr. We distinguish the stars that are moderately enriched in helium from those that are very helium-rich (initial helium mass fraction below and above 0.4, respectively), and compare the predictions of the FRMS framework with other scenarios for globular cluster enrichment.

Keywords
  1. astronomical-models
  2. globular-star-clusters
Bibliographic source Bibcode
2016A&A...592A.111C
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/592/A111
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/592/A111
Document Object Identifer DOI
doi:10.26093/cds/vizier.35920111

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/592/A111
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/592/A111
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/592/A111
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History

2016-08-08T07:54:41Z
Resource record created
2016-08-08T06:57:08Z
Updated
2016-08-08T07:54:41Z
Created

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr