Spectroscopic studies of extremely metal-poor stars with the Subaru High Dispersion Spectrograph. I. Observational data

被引:44
作者
Honda, S [1 ]
Aoki, W
Ando, H
Izumiura, H
Kajino, T
Kambe, E
Kawanomoto, S
Noguchi, K
Okita, K
Sadakane, K
Sato, B
Takada-Hidai, M
Takeda, Y
Watanabe, E
Beers, TC
Norris, JE
Ryan, SG
机构
[1] Natl Astron Observ, Tokyo 1818588, Japan
[2] Grad Univ Adv Studies, Dept Astron, Tokyo 1818588, Japan
[3] Natl Astron Observ Japan, Okayama Astrophys Observ, Okayama 7190232, Japan
[4] Natl Def Acad, Dept Earth & Ocean Sci, Kanagawa 2398686, Japan
[5] Osaka Kyoiku Univ, Astron Inst, Kashiwara, Osaka 5828582, Japan
[6] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan
[7] Tokai Univ, Liberal Arts Educ Ctr, Hiratsuka, Kanagawa 2591292, Japan
[8] Komazawa Univ, Setagaya Ku, Tokyo 1548525, Japan
[9] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA
[10] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
[11] Open Univ, Dept Phys & Astron, Milton Keynes MK7 6AA, Bucks, England
关键词
nuclear reactions; nucleosynthesis; abundances; stars : abundances; stars : Population II;
D O I
10.1086/383201
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have obtained high-resolution (R similar or equal to 50, 000 or 90,000), high-quality (S/N greater than or similar to 100) spectra of 22 very metal-poor stars ([Fe/H] less than or similar to - 2.5) with the High Dispersion Spectrograph fabricated for the 8.2 m Subaru Telescope. The spectra cover the wavelength range from 3500 to 5100 8; equivalent widths are measured for isolated lines of numerous elemental species, including the alpha-elements, the iron-peak elements, and the light and heavy neutron-capture elements. Errors in the measurements and comparisons with previous studies are discussed. These data will be used to perform detailed abundance analyses in the following papers of this series. Radial velocities are also reported and are compared with previous studies. At least one moderately r-process-enhanced metal-poor star, HD 186478, exhibits evidence of a small-amplitude radial velocity variation, confirming the binary status noted previously. During the course of this initial program, we have discovered a new moderately r-process-enhanced, very metal-poor star, CS 30306 - 132 ([Fe/H] = - 2.4; [Eu/Fe] = +0.85), which is discussed in detail in the companion paper.
引用
收藏
页码:113 / 128
页数:16
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