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Journal Article

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

MPS-Authors

Nordlander,  T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bessell,  M. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Da Costa,  G. S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mackey,  A. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Asplund,  M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casey,  A. R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chiti,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ezzeddine,  R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Frebel,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lind,  K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marino,  A. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Murphy,  S. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Norris,  J. E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schmidt,  B. P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yong,  D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.488L.109N
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D2C0-4
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.