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After the dissociation is completed, the exponent becomes .
This gas forms a second core composed of atomic hydrogen, which is called the second core
(points number 7-8 of Figure 4.13).
Since the accretion rate [eq.(4.75)] is proportional to or ,
the accretion rates onto the second core
is larger than that of the first core
Thus, the first core disappears quickly and after that the gas begins to accrete onto the second core,
which will be a protostar.
However, this is the case of non-rotating, spherical symmetric cloud collapse.
As previously seen, the angular momentum plays a crucial role and forms a disk.
The evolution must be different completely for such a case.