Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 30 LMi

Details Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 30 LMi Abundances of Carbon, Nitrogen, Oxygen, and Other Elements in the Atmosphere of the Giant 30 LMi

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47..865r&link_type=abstract

Astronomy Reports, vol. 47, Issue 10, p.865-872

Astronomy and Astrophysics

Astronomy

Scientific paper

We have studied the star 30 LMi using high-dispersion CCD spectra and photographic observations. We estimate the star's effective temperature T eff=7210 K, gravity log g=3.34, and microturbulence velocity ξt=5.8 km/s. The carbon abundance, log ɛ(C)=8.57, is close to the solar value. Nitrogen (log ɛ(N)=7.81), oxygen (log ɛ(O)=8.76), and sulfur (log ɛ(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 ɛ(Ti)=4.75), whereas zinc shows an over-abundance by +0.21 dex (log ɛ(Zn)=4.81). Sodium (log ɛ(Na)=6.26), silicon (log ɛ(Si)=7.57), calcium (log ɛ(Ca)=6.38), chromium (log ɛ(Cr)=5.62), iron (log ɛ(Fe)=7.51), nickel (log ɛ(Ni)=6.34), and yttrium (log ɛ(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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