On the identification problem of the infrared 'Keenan bands' in S stars

Details On the identification problem of the infrared 'Keenan bands' in S stars On the identification problem of the infrared 'Keenan bands' in S stars

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..300l&link_type=abstract

Astronomy and Astrophysics, vol. 84, no. 3, Apr. 1980, p. 300-303.

Astronomy and Astrophysics

Astrophysics

31

Infrared Spectra, Interstellar Chemistry, Near Infrared Radiation, S Stars, Spectral Bands, Stellar Spectra, Absorption Spectra, Identifying, Spectrograms, Spectrum Analysis, Stellar Structure

Scientific paper

On the basis of a medium-resolution near infrared spectrogram of the S star R Cyg and laboratory spectra of BaF, BaCl and NbO the identification problem of the so-called Keenan (1950, 1957) bands - appearing in S stars - is reviewed. These three molecules - previously suggested as responsible for the Keenan bands - are, however, ruled out as major contributors. A number of previously unknown bandheads of NbO in the spectral region 7800-8800 A are listed. On the other hand, the (0,0) band of CrH with a head at 8611.1 A precisely matches one of the Keenan bands, but a somewhat higher resolution spectrogram is needed for a line-by-line identification.

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