Article (Scientific journals)
Heavy elements in halo stars: the r/s-process controversy.
Magain, Pierre
1995In Astronomy and Astrophysics, 297, p. 686
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Keywords :
STARS: ABUNDANCES; STARS: HD 140283; STARS: POPULATION II; GALAXY: EVOLUTION; GALAXY: HALO; NUCLEOSYNTHESIS
Abstract :
[en] It has been suggested by Truran (1981) that rapid neutron captures (the r-process) dominate the production of heavy elements in very metal-poor stars. Several spectroscopic works analyzing that hypothesis are reviewed and rediscussed and it is shown that there is, in fact, no secure observational evidence in support of Truran's suggestion. A method to determine the odd-to-even isotopic ratio of barium, and thus to estimate the relative contributions of the r and s-processes, is presented. It takes advantage of the hyperfine structure affecting the spectral lines of the odd isotopes to distinguish them from the even isotopes. This method, applied to the classical metal-poor subgiant HD 140283, shows that the barium isotopic ratio in that star is in agreement with a pure s-process production, and excludes any significant enhancement of the r-process contribution, in disagreement with previous works based on elemental abundances.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Heavy elements in halo stars: the r/s-process controversy.
Publication date :
01 May 1995
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
297
Pages :
686
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 February 2010

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