Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-03-02
Astrophys.J. 632 (2005) 611-637
Astronomy and Astrophysics
Astrophysics
52 pages, 12 figures, 8 tables, to appear in ApJ
Scientific paper
10.1086/432862
Elemental abundance measurements have been obtained for a sample of 18 very metal-poor stars using spectra obtained with the Subaru Telescope High Dispersion Spectrograph. Seventeen stars, among which 16 are newly analyzed in the present work, were selected from candidate metal-poor stars identified in the HK survey of Beers and colleagues. The metallicity range covered by our sample is -3.1 ~< [Fe/H] ~< -2.4. The abundances of carbon, alpha-elements, and iron-peak elements determined for these stars confirm the trends found by previous work. One exception is the large over-abundance of Mg, Al and Sc found in BS16934--002, a giant with [Fe/H] = -2.8. By combining our new results with those of previous studies, we investigate the distribution of neutron-capture elements in very metal-poor stars, focusing on the production of the light neutron-capture elements (e.g., Sr, Y, and Zr).
Ando Hiroyasu
Aoki Wako
Beers Timothy C.
Honda Satoshi
Izumiura Hideyuki
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