Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..620h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 15, 1985, p. 620-627. Research supported by the Robert A. Welch Fo
Astronomy and Astrophysics
Astrophysics
31
Abundance, Barium, Giant Stars, Metallic Stars, Oxygen Isotopes, Stellar Evolution, Convection, Ratios, Spectrum Analysis, Stellar Envelopes, Stellar Mass, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
Harris and Lambert (1984) have reported observations of the O-16/O-17 and O-16/O-18 ratios in several red giant stars. The obtained data may be used as a basis for interpretation of the oxygen isotope ratios in stars which are believed to be further evolved, namely the barium, carbon, and S stars. The present investigation is concerned with the results for a group of classical and mild barium stars. Abundance determinations were made by analysis of high-resolution 2.3 micron spectra. In this spectral region the first overtone vibration-rotation bands of the CO molecule's ground electronic state give rise to a large number of absorption lines, including lines due to the isotopically substituted species (C-13)(O-16), (C-12)(O-17), and (C-12)(O-18). The stars studied include the Ba II stars HD 178717, HD 121447, HD 101013, and HR 774, and the mild barium stars 0 Vir and 16 Ser.
Harris Mark J.
Lambert David L.
Smith Verne V.
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