SIMBAD references

2019MNRAS.488L.109N - Mon. Not. R. Astron. Soc., 488, L109-L113 (2019/September-1)

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., CHITI A., EZZEDDINE R., FREBEL A., LIND K., MARINO A.F., MURPHY S.J., NORRIS J.E., SCHMIDT B.P. and YONG D.

Abstract (from CDS):

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.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - stars: individual: SMSS J160540.18-144323.1 - stars: Population III

Simbad objects: 6

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2022.12.03-09:47:34

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