Uniformly Rotating Homogeneous and Polytropic Rings in Newtonian Gravity

Details Uniformly Rotating Homogeneous and Polytropic Rings in Newtonian Gravity Uniformly Rotating Homogeneous and Polytropic Rings in Newtonian Gravity

2008-08-19

arxiv.org/abs/0808.2612v2

Mon.Not.Roy.Astron.Soc.389:156,2008

Astronomy and Astrophysics

Astrophysics

18 pages, 12 figures. This paper is essentially a combined version of arXiv:0802.0078 and arXiv:0802.0081 and was published in

Scientific paper

10.1111/j.1365-2966.2008.13540.x

An analytical method is presented for treating the problem of a uniformly rotating, self-gravitating ring without a central body in Newtonian gravity. The method is based on an expansion about the thin ring limit, where the cross-section of the ring tends to a circle. The iterative scheme developed here is applied to homogeneous rings up to the 20th order and to polytropes with the index n=1 up to the third order. For other polytropic indices no analytic solutions are obtainable, but one can apply the method numerically. However, it is possible to derive a simple formula relating mass to the integrated pressure to leading order without specifying the equation of state. Our results are compared with those generated by highly accurate numerical methods to test their accuracy.

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