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|a Simon, Joshua D.
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Frebel, Anna L.
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|a Chiti, Anirudh
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|a Thompson, Ian B.
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|a Shectman, Stephen A.
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|a Mateo, Mario
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|a Bailey, John I.
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|a Crane, Jeffrey D.
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|a Walker, Matthew
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|a Frebel, Anna L.
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|a Chiti, Anirudh
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|a Detection of a Population of Carbon-enhanced Metal-poor Stars in the Sculptor Dwarf Spheroidal Galaxy*
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|b American Astronomical Society,
|c 2018-08-27T15:04:59Z.
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|z Get fulltext
|u http://hdl.handle.net/1721.1/117539
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|a The study of the chemical abundances of metal-poor stars in dwarf galaxies provides a venue to constrain paradigms of chemical enrichment and galaxy formation. Here we present metallicity and carbon abundance measurements of 100 stars in Sculptor from medium-resolution (R ∼ 2000) spectra taken with the Magellan/Michigan Fiber System mounted on the Magellan-Clay 6.5 m telescope at Las Campanas Observatory. We identify 24 extremely metal-poor star candidates ([Fe/H] < -3.0) and 21 carbon-enhanced metal-poor (CEMP) star candidates. Eight carbon-enhanced stars are classified with at least 2σ confidence, and five are confirmed as such with follow-up R ∼ 6000 observations using the Magellan Echellette Spectrograph on the Magellan-Baade 6.5 m telescope. We measure a CEMP fraction of 36% for stars below [Fe/H] = -3.0, indicating that the prevalence of carbon-enhanced stars in Sculptor is similar to that of the halo (∼43%) after excluding likely CEMP-s and CEMP-r/s stars from our sample. However, we do not detect that any CEMP stars are strongly enhanced in carbon ([C/Fe] > 1.0). The existence of a large number of CEMP stars both in the halo and in Sculptor suggests that some halo CEMP stars may have originated from accreted early analogs of dwarf galaxies.
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|a National Science Foundation (U.S.) (Grant AST-1255160)
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|a Article
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|t Astrophysical Journal
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