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S. Leygnac (LUTH), T. Lanz (GSFC, U. Maryland, Associate member of the LUTH), C. Stehlé, C. Michaut (LUTH)
Radiative shocks are high Mach number shocks with a strong coupling between radiation and hydrodynamics which leads to a structure governed by a radiative precursor. They might be encountered in various astrophysical systems: stellar accretion shocks, pulsating stars, interaction of supernovae with the intestellar medium etc.
A numerical one dimensional (1D) stationary study of the coupling between hydrodynamics and radiative transfer is being performed. An estimate of the error made by the 1D approach in the radiative transfer treatment is done by an approximate short characteristics approach. It shows, for exemple, how much of the radiation escapes from the medium in the configuration of the experiment.
The experimental study of these shocks has been performed with the high energy density laser of the LULI, at the École Polytechnique (France). We have observed several shocks identified as radiative shocks. The shock waves propagate at about 50 km/s in a tiny 10 mm3 shock tube filled with gaz. From the measurements, it is possible to infer several features of the shock such as the speed and the electronic density.
The author(s) of this abstract have provided an email address for comments about the abstract: sebastien.leygnac@obspm.fr
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.