Article (Scientific journals)
Abundances of neutron capture elements in metal-poor dwarfs. I - Yttrium and zirconium
Zhao, G.; Magain, Pierre
1991In Astronomy and Astrophysics, 244, p. 425-432
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Keywords :
DWARF STARS; SIGNAL TO NOISE RATIOS; STELLAR COMPOSITION; YTTRIUM; ZIRCONIUM; ASTRONOMICAL SPECTROSCOPY; GALACTIC EVOLUTION; IRON; METALLICITY; NEUTRONS; STELLAR ATMOSPHERES
Abstract :
[en] The yttrium and zirconium abundances are determined in a sample of 20 metal-poor stars on the basis of high resolution, high SNR spectra. Significant differences between the behaviors of these two neighboring elements are found, zirconium being less deficient than yttrium in Population II stars. Moreover, there is a genuine cosmic scatter in the abundances of these two elements relative to iron, of the order of 20 percent. The scatter is lower when these elements are compared to titanium, which might indicate that a significant fraction of the lighter neutron-capture elements are produced in massive stars.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Zhao, G.;  European Southern Observatory, Garching, Federal Republic of Germany ; Nanjing University, People's Republic of China
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Language :
English
Title :
Abundances of neutron capture elements in metal-poor dwarfs. I - Yttrium and zirconium
Publication date :
01 April 1991
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
244
Pages :
425-432
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 01 February 2010

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