Abundances of carbon,nitrogen, oxygen,and other elements in the atmosphere of the giant 30 LMi |
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Authors: | T. M. Rachkovskaya |
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Affiliation: | (1) Crimean Astrophysical Observatory, Nauchnyi, Crimea, 98409, Ukraine |
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Abstract: | We have studied the star 30 LMi using high-dispersion CCD spectra and photographic observations. We estimate the star's effective temperature Teff=7210 K, gravity log g=3.34, and microturbulence velocity ξt=5.8 km/s. The carbon abundance, log ?(C)=8.57, is close to the solar value. Nitrogen (log ?(N)=7.81), oxygen (log ?(O)=8.76), and sulfur (log ?(S)=7.20) are slightly underabundant compared to the Sun, by ?0.16 dex, ?0.11 dex, and ?0.13 dex, respectively. A relatively large underabundance of ?0.27 dex was found for titanium (log ?(Ti)=4.75), whereas zinc shows an over-abundance by +0.21 dex (log ?(Zn)=4.81). Sodium (log ?(Na)=6.26), silicon (log ?(Si)=7.57), calcium (log ?(Ca)=6.38), chromium (log ?(Cr)=5.62), iron (log ?(Fe)=7.51), nickel (log ?(Ni)=6.34), and yttrium (log ?(Y)=2.34) exhibited abundances close to the solar values. We find no chemical anomalies characteristic of Am stars or δ Scuti stars in the spectrum of 30 LMi. |
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