Atomic processes and radiation transport in stars

Details Atomic processes and radiation transport in stars Atomic processes and radiation transport in stars

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aipc..168...42m&link_type=abstract

AIP Conference Proceedings, Volume 168, pp. 42-50 (1988).

Astronomy and Astrophysics

Astrophysics

1

Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Plasma Diagnostic Techniques And Instrumentation, Atomic, Molecular, Ion, And Heavy-Particle Collisions

Scientific paper

To illustrate the tremendous range in physical conditions encountered in analyses of radiation from various astrophysical sources, we discuss representative physical conditions in several zones of a typical star. Even though these zones do not cover the full range of physical conditions encountered in the most exotic astronomical objects, they nevertheless give a good idea of the kinds of data required in astrophysical work. Moreover they provide a sequence of states progressively farther from equilibrium.
We discuss the physical mechanisms important in determining the internal state (i.e., excitation and ionization degrees) of the material in each of the regimes chosen, and comment on whether one should expect equilibrium or non-equilibrium distribution functions. In parallel, we delineate the major issues affecting the transport of radiation through typical astrophysical media; material properties, equilibrium versus non-equilibrium, velocity fields, and dynamics. We attempt to emphasize the close interplay between the nature of the radiation field and the state of the material. We also try to mention where progress is being slowed by lack of data for atomic processes, and indicate what kinds of data are still needed.

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