Abundances of neutron capture elements in metal-poor dwarfs. I - Yttrium and zirconium

Details Abundances of neutron capture elements in metal-poor dwarfs. I - Yttrium and zirconium Abundances of neutron capture elements in metal-poor dwarfs. I - Yttrium and zirconium

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..425z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 425-432.

Astronomy and Astrophysics

Astrophysics

34

Dwarf Stars, Signal To Noise Ratios, Stellar Composition, Yttrium, Zirconium, Astronomical Spectroscopy, Galactic Evolution, Iron, Metallicity, Neutrons, Stellar Atmospheres

Scientific paper

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.

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