The C2H, C2, and CN electronic absorption bands in the carbon star HD 19557

Details The C2H, C2, and CN electronic absorption bands in the carbon star HD 19557 The C2H, C2, and CN electronic absorption bands in the carbon star HD 19557

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..190g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 190-199.

Astronomy and Astrophysics

Astronomy

32

Absorption Spectra, Carbon Stars, Cyanogen, Electronic Spectra, Infrared Astronomy, Stellar Spectrophotometry, Infrared Spectra, Molecular Spectra, Stellar Atmospheres

Scientific paper

Infrared spectrophotometry of the R-type carbon star HD 19557 is presented. Two unusual spectroscopic features are seen: a 3.1 micron band is lacking and a 2.8 micron band is present. Identifications are proposed for three previously unreported stellar absorption bands with electronic sequences of C2, CN, and C2H. The latter is proposed to be responsible for the 2.8 micron feature. The atmospheric structure of the star is studied with synthetic spectra, and an effective temperature between 2600 K and 3000 K is suggested. No SiC emission is seen at 11.3 microns, indicating that grain formation is not a viable process around the star. The lack of dust in R stars may suggest a salient difference between R and N types.

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