Detection of Silver in Metal-Poor Stars

Details Detection of Silver in Metal-Poor Stars Detection of Silver in Metal-Poor Stars

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.2489c&link_type=abstract

The Astronomical Journal, Volume 116, Issue 5, pp. 2489-2494.

Astronomy and Astrophysics

Astronomy

19

Galaxy: Halo, Stars: Abundances, Stars: Population Ii

Scientific paper

The resonance lines of neutral silver appearing at 3280, 3382 Å in the near-ultraviolet spectral region have been identified on Keck I HIRES spectra of four halo stars with metallicities -1.3 >= [Fe/H] >= -2.2. This represents the first detection in metal-poor stars of an element in the atomic number range 41 <= Z <= 55. The mean relative silver abundance is <[Ag/Fe]> ~= +0.2, with little star-to-star variation. Silver abundance upper limits in three other metal-poor stars are consistent with this mean value. The modest overabundance of silver is similar to the overabundances in this metallicity range exhibited by other neutron-capture elements whose primary nucleosynthesis origin is the r-process (such as europium and dysprosium).

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