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The Effect of Silicon and Carbon opacity on ultraviolet stellar spectra

Published online by Cambridge University Press:  14 August 2015

Owen Gingerich  and
David Latham
Owen Gingerich
Affiliation:
Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass., U.S.A.
David Latham
Affiliation:
Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass., U.S.A.

Abstract

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Silicon and especially carbon bound-free absorptions considerably reduce the emergent flux in the ultraviolet for stars near spectral type A0 (Teff = 10000 K). An overabundance of silicon and/or an underabundance of carbon can affect the Balmer discontinuity and the Paschen continuum by a few per cent at most. However, the abundances of these ultraviolet absorbers will have little effect on the temperature distribution calculated for a star if the model is chosen to match the visual spectrum. An examination of the ultraviolet spectrum of Sirius shows that still more opacity is needed; part of this absorption can be supplied by line blanketing.

Type
Part I: Stellar Fluxes
Information
Symposium - International Astronomical Union , Volume 36: Ultraviolet Stellar Spectra and Related Ground-Based Observations , 1970 , pp. 64 - 70
Copyright
Copyright © Reidel 1970 

References

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