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Yujuan Liu, Bun’ei Sato, Yoichi Takeda, Hiroyasu Ando, Gang Zhao, Stellar Parameters and Abundance Analysis of 58 Late G Giants, Publications of the Astronomical Society of Japan, Volume 62, Issue 4, 25 August 2010, Pages 1071–1084, https://doi.org/10.1093/pasj/62.4.1071
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Abstract
We present stellar atmospheric parameters, and kinematic parameters for a part of Xinglong Planet Search Program sample – 58 late G-type giants, obtained at Okayama Astrophysical Observatory. Additionally, we determined the chemical abundances, especially for the elements C, O, and Na. The metallicity distribution of our sample ranges covered from |$-$|0.6 to 0.2 in [Fe|$/$|H], which supports the previous results, suggesting a lack of super metal-rich giants with [Fe|$/$|H] |$\gt +$|0.2. The abundance of C is depleted by 0.13 dex, and [Na|$/$|Fe] shows an overabundance of 0.1 dex compared to a dwarf with the same spectral type, while the O abundance was not altered after the first dredge up. These results are consistent with theoretical predictions of stellar evolution. The behaviors of Si, Ca, Ti, Cr, Ni, Mn, ScII, YII, and CeII in our giants follow the same trends as in dwarfs.