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For
,
the exponent becomes .
In this density range of
the temperature exceeds K.
Due to this temperature, the hydrogen molecules begin to dissociate and the dissociation
process absorbs the energy.
By this, gas becomes much softer (
) than the first core.
This introduces another dynamical contraction, the second collapse (points number 6-7 of Figure 4.13).
Kohji Tomisaka
2007-07-08