Other
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..442l&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, April 1986, p. 442-447.
Other
11
Cepheid Variables, Stellar Composition, Supergiant Stars, Abundance, Carbon, F Stars, G Stars, Metallicity, Nitrogen, Oxygen
Scientific paper
From high signal-to-noise coude Reticon spectral obtained at Lick Observatory, the chemical composition of the bright Population I Cepheid Polaris (Alpha UMi) has been determined. The chemical abundances in Polaris are found to be completely typical of normal F-G supergiants. The iron abundance is solar (Fe/H = 0.0), and other metals are present in essentially solar ratios. Carbon is deficient (C/H = -0.4) and nitrogen overabundant (N/H = +0.4) relative to solar abundances, indicating the presence of CN-cycle products at the surface. Oxygen shows an underabundance (O/H = -0.2) that is also typical of F-G supergiants, but is not as easily understood.
Bond Howard E.
Luck Earle R.
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