期刊
ASTROPHYSICAL JOURNAL
卷 808, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/808/1/53
关键词
stars: abundances; stars: fundamental parameters; stars: Population II
资金
- NSF [AST-1255160]
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1255160] Funding Source: National Science Foundation
With [Fe/H] similar to -3.3, CD -24 degrees 17504 is a canonical metal-poor main-sequence turn-off star. Though it has appeared in numerous literature studies, the most comprehensive abundance analysis for the star based on high-resolution, high signal-to-noise ratio (S/N) spectra is nearly 15 years old. We present a new detailed abundance analysis for 21 elements based on combined archival Keck-HIRES and Very Large Telescope-UVES spectra of the star that is higher in both spectral resolution and S/N than previous data. Our results are very similar to those of an earlier comprehensive study of the star, but we present for the first time a carbon abundance from the CH G-band feature as well as improved upper limits for neutron-capture species such as Y, Ba, and Eu. In particular, we find that CD -24 degrees 17504 has [Fe/H] = -3.41, [C/Fe] = +1.10, [Sr/H] = -4.68, and [Ba/H] <= -4.46, making it a carbone-nhanced metal-poor star with neutron-capture element abundances among the lowest measured in Milky Way halo stars.
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