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- W2167988666 abstract "Towards clarifying the properties of late-G giants, for which we are currently conducting a planet-search project at Okayama Astrophysical Observatory, an extensive spectroscopic study has been performed for our first target sample of fifty-seven G6–G9 III stars, in order to establish the atmospheric parameters (|$T_{mathrm{eff}}, log g, v_mathrm{t}$|, and |$mathrm{[Fe/H]}$|), the stellar mass along with the evolutionary status, and the photospheric abundances of various elements. It was confirmed that the conventional spectroscopic method of parameter determination using Fe I / II lines with the assumption of LTE works successfully for these evolved stars. We determined the abundances (relative to the Sun) of 19 elements, and examined how their |$mathrm{[X/Fe]}$| ratios behave themselves with the run of |$mathrm{[Fe/H]}$|. While the trends appear to be similar to those exhibited by disk dwarfs for a number of elements, some elements (C, O, Na) showed appreciable anomalies, which may be interpreted as being due to a dredge-up of nuclear-processed material. Since the |$mathrm{[Fe/H]}$| values of these stars tend to be somewhat biased towards a subsolar regime, some mechanism of slightly reducing the metallicity might be suspected." @default.
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- W2167988666 date "2005-02-25" @default.
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- W2167988666 title "Stellar Parameters and Photospheric Abundances of Late-G Giants: Properties of the Targets of the Okayama Planet Search Program" @default.
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- W2167988666 doi "https://doi.org/10.1093/pasj/57.1.109" @default.
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