CD −24°17504 REVISITED: A NEW COMPREHENSIVE ELEMENT ABUNDANCE ANALYSIS
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Jacobson-2015-CD-24 degrees 17504.pdf
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Author(s)
Frebel, Anna L.
Jacobson, Heather
Date Issued
July 2015
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Jacobson, Heather R., and Anna Frebel. “CD −24°17504 REVISITED: A NEW COMPREHENSIVE ELEMENT ABUNDANCE ANALYSIS.” The Astrophysical Journal 808, no. 1 (July 17, 2015): 53. © 2015 The American Astronomical Society
Version
Final published version
Abstract
With [Fe/H] ~ −3.3, CD −24°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°17504 has [Fe/H] = −3.41, [C/Fe] = +1.10, [Sr/H] = −4.68, and [Ba/H] ≤ −4.46, making it a carbon-enhanced metal-poor star with neutron-capture element abundances among the lowest measured in Milky Way halo stars.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/808/1/53
