Statistics – Computation
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ap%26ss.159..339p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 159, no. 2, Sept. 1989, p. 339-346.
Statistics
Computation
Aberration, Absorptivity, Advection, Computational Astrophysics, Radiative Transfer, Emission Spectra, Plancks Constant, Radiation Distribution
Scientific paper
Results of calculations are presented of the mean intensity changes that would occur due to the presence of aberration and advection terms in the radiative transfer equation given by replacement of the source function by the Planck function. A nonscattering absorbing medium is considered, with velocities of 1000, 2000, 3000, 4000, and 5000 km/sec. The calculations are done in a comoving frame with a monochromatic radiation field. Two types of absorbing media are considered: one with a source of constant emission, and another with an emission source. It is found that, for a total optical depth of one, the maximum change is about two percent when the Planck function, B(r), is one, and about six percent when B(r) varies inversely as the square of the number of layers. When the optical depth increases to five, the maximum change, in the case of a constant source function, falls to 1.5 percent. In the other case, where B(r) varies as 1/r-squared, the maximum changes remain at six percent.
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