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The lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1

Nordlander, Thomas; Bessell, Michael; Da Costa, Gary; Mackey, Dougal; Asplund, Martin; Casey, A. R.; Chiti, Anirudh; Ezzeddine, Rana; Frebel, Anna; Lind, K.; Marino, Anna Fabiola; Murphy, Simon; Norris, John; Schmidt, Brian; Yong, David


We report the discovery of SMSS J160540.18−144323.1, a new ultra metal-poor halo star discovered with the SkyMapper telescope. We measure [Fe/H] = −6.2 ± 0.2 (1D LTE), the lowest ever detected abundance of iron in a star. The star is strongly carbonenhanced, [C/Fe] = 3.9 ± 0.2, while other abundances are compatible with an α-enhanced solar-like pattern with [Ca/Fe] = 0.4 ± 0.2, Mg/Fe = 0.6 ± 0.2, [Ti/Fe] = 0.8 ± 0.2, and no significant s- or r-process enrichment, [Sr/Fe] < 0.2 and [Ba/Fe] < 1.0...[Show more]

CollectionsANU Research Publications
Date published: 2019-06-27
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnrasl/slz109
Access Rights: Open Access


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