Diploma Thesis
The Eddington-Limit in accretion discs
( Das Eddington-Limit in Akkretionsscheiben )
Dominikus Heinzeller
Abstract:
Although the Eddington-Limit has originally been derived for stars, it also
becomes
important in the theory of accretion discs. In the here presented diploma
thesis,
the critical accretion rate corresponding to the Eddington-Limit is
calculated
from various disc models. It is shown that the obtained results
can differ extremely from the classical Eddington accretion rate,
depending on the disc model. One main consequence thereby is the fact,
that these accretion rates can be significantly higher in the outer regions,
whilst getting close to the classical quantity in the inner regions of
the disc.
In more detailed investigations of the inner part of the disc, a simple
model
is built, showing up a possible explanation for jets originating from the
inner
region. At the same time, this model provides a potential mechanism for
transferring
angular momentum out of the disc.
Thesis: ps.gz file (4630531 Bytes)
only available in German