Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...332..421j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 332, Sept. 1, 1988, p. 421-431. Research supported by Indiana University.
Astronomy and Astrophysics
Astrophysics
18
Carbon Stars, Giant Stars, Opacity, Stellar Spectra, Ultraviolet Spectra, Brightness Temperature, Continuous Spectra, K Stars, Line Spectra, M Stars, Stellar Atmospheres
Scientific paper
The paper considers the longstanding problem of the 'violet opacity' in cool carbon stars by testing, through synthetic spectra, many new and previously suggested opacity sources, based on currently available model atmospheres for carbon stars and M giant stars. While several bound-free edges of neutral metals are important opacity sources, those of Na I at at 2413 A, Mg I at 2514 A, and particularly Ca I at 2940 A are especially significant. Collectively, thousands of atomic lines are important, and the enormous line of Mg I at 2852 A influences the spectrum well into the visible. The pseudocontinuum of C3 and the photoionization continuum of CH both play noticeable but secondary roles. Synthetic spectra form the carbon star models with and without polyatomic molecules fit nicely the collected observations of the well-observed carbon star TX Psc.
Faulkner Danny R.
Johnson Hollis R.
Luttermoser Donald G.
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