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Chemical abundances in 43 metal-poor stars
Gustafsson, Bengt; Asplund, Martin; Edvardsson, Bengt et al.
2005In Hill, V.; François, P.; Primas, F. (Eds.) From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution
 

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Abstract :
[en] We have derived abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, V, Cr, Fe, Ni and Ba for 43 metal-poor field stars, mostly stars at the turn-off point and on the subgiant branch, in the interval {-}3.0{[Fe/H]{. The analysis is differential relative to the Sun. Oxygen abundances, with consideration of NLTE effects, were derived from the OI 777.4 nm triplet lines. We find [O/Fe] to gradually increase with decreasing [Fe/H], though considerably slower than has earlier been obtained from OH lines in the UV. A scatter in [O,Mg,Ca,Ti/Fe] at a given [Fe/H] is found and we argue that this scatter is partly real. The deviations from the mean trends of abundance ratios vs [Fe/H] are found to correlate in non-trivial ways for different abundances. Similar trends are found from results of accurate studies by other groups. This seems to give further evidence for the hypothesis that the stars once formed in different subsystems, with different star-formation rates.The paper is in press in A&A, may be obtained as astro-ph/0505118.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gustafsson, Bengt
Asplund, Martin
Edvardsson, Bengt
Jonsell, Karin
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Nissen, Poul Erik
Language :
English
Title :
Chemical abundances in 43 metal-poor stars
Publication date :
2005
Event name :
From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium 228
Event organizer :
International Astronomical Union
Event place :
Paris, France
Event date :
du 23 mai 2005 au 27 mai 2005
Audience :
International
Main work title :
From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution
Editor :
Hill, V.
François, P.
Primas, F.
Collection name :
IAU Symposium 228
Pages :
259-259
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