Reference : Accretion of gas by globular cluster stars
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/16797
Accretion of gas by globular cluster stars
English
Thoul, Anne mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Evol. et stabilité des étoiles et des amas d'étoiles (ESEA) >]
Jorissen, Alain [Institut d'Astronomie et d'Astrophysique, CP 226, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium]
Goriely, Stéphane [Institut d'Astronomie et d'Astrophysique, CP 226, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Bruxelles, Belgium]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Magain, Pierre mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
Noels-Grötsch, Arlette mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Parmentier, Geneviève [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
1-Feb-2001
Astronomy and Astrophysics
EDP Sciences
383
491-501
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] GALAXY: GLOBULAR CLUSTERS: GENERAL ; STARS: ABUNDANCES ; STARS: CHEMICALLY PECULIAR ; STARS: AGB AND POST-AGB
[en] Some recent observations of the abundances of s-process, r-process, and alpha elements in metal-poor stars have led to a new scenario for their formation. According to this scenario, these stars were born in a globular cluster and accreted the s-process enriched gas expelled by cluster stars of higher-mass, thereby modifying their surface abundances. Later on, these polluted stars evaporated from the globular cluster to constitute an important fraction of the current halo population. In addition, there are now many direct observations of abundance anomalies not only in globular cluster giant stars but also in subgiant and main-sequence stars. Accretion again provides a plausible explanation for (at least some of) these peculiarities. Here we investigate further the efficiency of the accretion scenario. We find that in concentrated clusters with large escape velocities, accretion is very efficient and can indeed lead to major modifications of the stellar surface abundances.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals
http://hdl.handle.net/2268/16797
10.1051/0004-6361:20011789
http://adsabs.harvard.edu/abs/2002A%26A...383..491T
http://de.arxiv.org/abs/astro-ph/0201341
The authors thank EDP Sciences for their deposit authorization

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