Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...401...43w&link_type=abstract
Astronomy and Astrophysics, v.401, p.43-56 (2003)
Astronomy and Astrophysics
Astrophysics
4
Diffusion, Radiative Transfer, Stars: Interiors, Novae, Cataclysmic Variables, Supernovae: General
Scientific paper
For a given velocity and temperature field in a differentially moving 3D medium, the vector of the radiative flux is derived in the diffusion approximation. Due to the dependence of the velocity gradient on the direction, the associated effective opacity in general is a tensor. In the limit of small velocity gradients analytical expression are obtained which allow us to discuss the cases when the direction of the flux vector deviates from that of the temperature gradient. Furthermore the radiative flux is calculated for infinitely sharp, Poisson distributed spectral lines resulting in simple expressions that provide basic insight into the effect of the motions. In particular, it is shown how incomplete line lists affect the radiative flux as a function of the velocity gradient. Finally, the connection between our formalism and the concept of the expansion opacity introduced by Karp et al. (\cite{karp}) is discussed.
Baschek Bodo
von Waldenfels W.
Wehrse Rainer
No associations
LandOfFree
The diffusion of radiation in moving media. IV. Flux vector, effective opacity, and expansion opacity does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The diffusion of radiation in moving media. IV. Flux vector, effective opacity, and expansion opacity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The diffusion of radiation in moving media. IV. Flux vector, effective opacity, and expansion opacity will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-918428