SIMBAD references

2011ApJ...730...77H - Astrophys. J., 730, 77 (2011/April-1)

Spectroscopic studies of extremely metal-poor stars with the Subaru high dispersion spectrograph. V. The zn-enhanced metal-poor star BS 16920-017.


Abstract (from CDS):

We report Zn abundances for 18 very metal-poor stars studied in our previous work, covering the metallicity range -3.2< [Fe/H] ←2.5. The [Zn/Fe] values of most stars show an increasing trend with decreasing [Fe/H] in this metallicity range, confirming the results found by previous studies. However, the extremely metal-poor star BS 16920-017([Fe/H] =-3.2) exhibits a significantly high [Zn/Fe] ratio ([Zn/Fe] = +1.0). Comparison of the chemical abundances of this object with HD 4306, which has similar atmospheric parameters to BS 16920-017, clearly demonstrates a deficiency of α elements and neutron-capture elements in this star, along with enhancements of Mn and Ni, as well as Zn. The association with a hypernova explosion that has been proposed to explain the high Zn abundance ratios found in extremely metal-poor stars is a possible explanation, although further studies are required to fully interpret the abundance pattern of this object.

Abstract Copyright:

Journal keyword(s): nuclear reactions, nucleosynthesis, abundances - stars: abundances - stars: individual: BS 16920-017 - stars: Population II - supernovae: general

CDS comments: UMa II-S1 = 2MASS J08495341+6308216 in Simbad.

Simbad objects: 26

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