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Approximate formulation of redistribution in the Ly-alpha, Ly-beta, H-alpha systemSimple approximate formulas are given for the coupled redistribution of Ly-alpha, Ly-beta, and H-alpha, by using well-defined approximations to an essentially exact formulation. These formulas incorporate all the essential physics including Raman scattering, lower state radiative decay, and correlated terms representing emission during a collision which must be retained in order that the emission coefficients are properly behaved in the line wings. Approximate expressions for the appropriate line broadening parameters are collected. Finally, practical expressions for the source functions are given. These are formulated through newly introduced nonimpact redistribution functions, which are shown to be reasonably approximated by existing (ordinary and generalized) redistribution functions.
Document ID
19890066500
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cooper, J.
(Otago Univ. Dunedin, New Zealand)
Ballagh, R. J.
(Otago, University Dunedin, New Zealand)
Hubeny, I.
(Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 14, 2013
Publication Date
September 15, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 344
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A53871
Funding Number(s)
CONTRACT_GRANT: NSF PHY-86-04505
CONTRACT_GRANT: NSF INT-86-02095
Distribution Limits
Public
Copyright
Other

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