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


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