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I will present some results of the calculations of the collapse of a dense
core. We use three approximations of the grey RHD. We simulate the
collapse of a 1 solar Mass cloud with a radius R = 10000 AU with a 1D
Lagrangian
grid. The inital cloud has a uniform density and a uniform temperature
(10K). We
compare the results using the M1 approximation, the flux limited diffusion
approximation and a barotropic equation of state approximation.
I use different opacities at high and low temperatures.
I will also present first results of the second core calculations. I use the
various equations of state
to take into account the dissociation and the ionisation of
hydrogen in order to resolve the second core.
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