Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..295s&link_type=abstract
Astronomy and Astrophysics, vol. 62, no. 1-2, Jan. 1978, p. 295-298.
Astronomy and Astrophysics
Astrophysics
11
Abundance, Molecular Spectra, Red Giant Stars, Stellar Spectra, Density (Number/Volume), Hafnium Oxides, Heavy Elements, Optical Thickness, Spectrum Analysis, Stellar Atmospheres, Stellar Models, Stellar Temperature, Tantalum Oxides, Zirconium Oxides
Scientific paper
A new approach to the problem of the identification of molecular features observed in the spectra of pure S stars has been attempted. From calculations of the chemical equilibrium in cool stellar models, including a very large number of compounds, a first selection has been made among molecules which ought to be present in S stars. On the basis of these predictions, a search has been made for bands of these new compounds in spectrograms of R Cyg recently obtained by Wyckoff and Wehinger. The presence of some new molecules, such as HfO and TaO, in this pure S star is proposed, but the lack of complete laboratory data and the existence of numerous blends in the stellar spectrum render very difficult any definite identification.
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