Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..739h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 739-745. Research supported by the Robert A. Welch F
Astronomy and Astrophysics
Astrophysics
60
Abundance, Oxygen Isotopes, Stellar Atmospheres, Stellar Spectra, Supergiant Stars, Nuclear Fusion, Red Giant Stars, Stellar Envelopes, Stellar Evolution
Scientific paper
Betelgeuse (Alpha Ori) and Antares (Alpha Sco) are red supergiants with an extensive convective outer envelope. The present investigation is concerned with an analysis of high-resolution 5 micron spectra of the two stars. The considered spectra had been acquired with the Fourier transform spectrometer at the coude focus of the Mayall 4 m reflector. A red supergiant's extensive atmosphere ensures that the less abundant species involving O-17 and O-18 contribute a significant number of lines. The obtained isotopic abundance ratios are presented in a table, taking into account C-12/C-13, O-16/O-17, O-16/O-18, and O-17/O-18. The nucleosynthesis of oxygen isotopes is discussed. An analysis of the oxygen isotopes in the atmosphere of the two stars shows that O-17 is enriched because of the CNO cycles and convective mixing.
Harris Mark J.
Lambert David L.
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