Statistics – Computation
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..269b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 269-274.
Statistics
Computation
11
Computational Astrophysics, Computerized Simulation, Line Shape, Stellar Envelopes, Stellar Spectra, Fortran, Run Time (Computers), Stellar Atmospheres, Velocity Distribution
Scientific paper
A computational technique is presented for calculating line-profiles from astronomical envelopes with complex velocity regions. The velocity field is assumed to accelerate outward through an envelope with no continuous opacity source. The emergent intensity is integrated numerically from the source to its maximum radius after evaluating a set of impact parameters at all locations on the outward bound rays. Account is taken of the interactions experienced by the photons and the optical depth at which the emergent intensity is measured. A method for separating out and integrating the fast-varying part of the emergent intensity is defined. The resultant code is demonstrated with calculations of power-law velocities. The model, written in FORTRAN77, is recommended for a variety of spectral line calculations, including static chromospheres and extended envelopes.
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