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Carbon, nitrogen, and oxygen abundances in Betelgeuse
Lambert, D. L.; Brown, J. A.; Hinkle, K. H.; Johnson, H. R.
AA(Texas, University, Austin, TX), AB(Texas, University, Austin, TX), AC(Kitt Peak National Observatory, Tucson, AZ), AD(Indiana University, Bloomington, IN)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 223-237. Research supported by the Robert A. Welch Foundation. (ApJ Homepage)
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NASA/STI Keywords:
Carbon Stars, Nuclear Fusion, Red Giant Stars, Stellar Composition, Stellar Cores, Supergiant Stars, Abundance, Infrared Spectra, M Stars, Nitrogen, Oxygen, Stellar Atmospheres, Stellar Models, Stellar Spectra, Vibrational Spectra
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Elemental abundances of C, N, and O in the red M supergiant Belegeuse are discussed to characterize their source. The discussion is based on previous data on weak CO second-overtone V-R lines near 1.6 micron, the NH fundamental V-R 1-0 and 2-1 bands between 3 and 4 microns, the OH fundamental V-R bands near 3 microns, and the CN red system lines near 2 microns. Attention is also given to the forbidden O I lines and the 8000 A CN red system lines, and to comparisons between models for the stellar atmosphere and the data. A model for an effective temperature of 3800 K, a surface gravity of 0.0, and a microturbulence of 4 km/sec is adopted which, if Betelgeuse is metal rich, would require forbidden lines of Fe/H to be near 0.1. The forbidden CNO would be -0.04 relative to the sun. The C/N ratio is nonsolar, which suggests contamination of the Betelgeuse atmosphere with CN processed material.

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