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

Nordlander, T., Bessell, M. S., Da Costa, G. S., Mackey, A. D., Asplund, M., Casey, A. R., et al. (2019). The lowest detected stellar Fe abundance: the halo star SMSS J160540.18-144323.1. Monthly Notices of the Royal Astronomical Society, 488, L109-L113.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D2C0-4 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D2C1-3
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019MNRAS.488L.109N (Any fulltext)
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 Creators:
Nordlander, T.1, Author
Bessell, M. S.1, Author
Da Costa, G. S.1, Author
Mackey, A. D.1, Author
Asplund, M.1, Author
Casey, A. R.1, Author
Chiti, A.1, Author
Ezzeddine, R.1, Author
Frebel, A.1, Author
Lind, K.1, Author
Marino, A. F.1, Author
Murphy, S. J.1, Author
Norris, J. E.1, Author
Schmidt, B. P.1, Author
Yong, D.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: stars: abundances stars: individual: SMSS J160540.18-144323.1 stars: Population III Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 Abstract: 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 carbon-enhanced, [{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 (3σ limits). Population III stars exploding as fallback supernovae may explain both the strong carbon enhancement and the apparent lack of enhancement of odd-Z and neutron-capture element abundances. Grids of supernova models computed for metal-free progenitor stars yield good matches for stars of about 10 M_☉ imparting a low kinetic energy on the supernova ejecta, while models for stars more massive than roughly 20 M_☉ are incompatible with the observed abundance pattern.

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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: 488 Sequence Number: - Start / End Page: L109 - L113 Identifier: -