Stationary Population III accretion discs

Abstract

We present stationary models of protostellar population III (Pop III, for short) accretion discs, compare them to Pop I discs, and investigate the influence of the different chemical compositions on the occurence of gravitational, thermal and thermal-viscous instabilities in the discs. In particular in the cooler regions, we find major differences between Pop III and Pop I discs, both in the structure and stability behaviour. This is mainly due to the absence of most molecules and dust in Pop III, which are very efficient absorbers in Pop I discs.

12 pages, 6 figures, resubmitted to MNRAS, very minor changes made in response to latest referee report, Figure 1+2 only in low-res, for high-res colour PDF file see http://www.ita.uni-heidelberg.de/~mm/publications/MayerDuschl-1.pdf

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