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The violet and ultraviolet opacity problem for carbon starsThe 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.
Document ID
19880063999
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Johnson, Hollis R.
(Indiana Univ. Bloomington, IN, United States)
Luttermoser, Donald G.
(Indiana Univ. Bloomington, IN, United States)
Faulkner, Danny R.
(Indiana University Bloomington, United States)
Date Acquired
August 13, 2013
Publication Date
September 1, 1988
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 332
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
88A51226
Funding Number(s)
CONTRACT_GRANT: NSF AST-82-05800
CONTRACT_GRANT: NAG5-182
CONTRACT_GRANT: NSF AST-85-20539
Distribution Limits
Public
Copyright
Other

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