Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61..549s&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.61, No.3, pp.549--561
Astronomy and Astrophysics
Astronomy
6
Galaxy: Evolution, Stars: Abundances, Stars: Abundances: Zinc, Stars: Population Ii
Scientific paper
The local thermodynamic equilibrium (LTE) abundances of zinc (Zn) of our sample of 35 metal-poor stars were explored in the range of -3.0 < [Fe/H] < 0.0. Based on a combination of our Zn abundances and those obtained in the literature, the behavior of Zn was investigated in the range of -4.2 < [Fe/H] < +0.5. The main results are as follows: (1) No clear separation in [Zn/Fe] behavior was found between halo, thick disk, and thin disk stars in our sample. (2) The decreasing trend of [Zn/Fe] with the increase of [Fe/H] was found to be confirmed to -4.2 < [Fe/H] ≤ -2.0, and to be explained by a chemical evolution model constructed with models of core-collapse supernovae (SNe) II or hypernovae (HNe) of Population III stars. (3) In -2.0 < [Fe/H] < +0.5, [Zn/Fe] follows a nearly flat trend with a slight enhancement of ˜+0.07 dex up to [Fe/H] = -1.0, and shows the more enhanced trend in -1.0 < [Fe/H] ≤ -0.5, and then gradually decreases to an almost solar value in [Fe/H] > -0.5. This trend is better explained by a chemical evolution model constructed with models of normal SNe II, HNe, and SNe Ia, in which the metallicity effect and the single-degenerate scenario of the SNe Ia model are incorporated.
Honda Satoshi
Saito Yu-ji
Takada-Hidai Masahide
Takeda Yoichi
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