Twisted accretion discs. IV - Alignment in polytropic discs and low alpha limit

Details Twisted accretion discs. IV - Alignment in polytropic discs and low alpha limit Twisted accretion discs. IV - Alignment in polytropic discs and low alpha limit

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233...33k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, July 1, 1988, p. 33-49. Research supported by the

Astronomy and Astrophysics

Astronomy

10

Accretion Disks, Eclipsing Binary Stars, Polytropic Processes, Twisting, X Ray Binaries, Alignment, Isothermal Processes, Kepler Laws, Perturbation Theory, Radio Jets (Astronomy), Shear Flow, Star Formation, Viscosity

Scientific paper

Twisted thin accretion discs are of interest in explaining long-term periodicities in X-ray binaries, the eclipse in Epsilon Aurigae, and perhaps precessing radio jets and possible warped molecular outflows in star-forming regions. Earlier results used isothermal discs to determine the alignment radius, Ra. Now the author sees how polytropic discs affect earlier results for discs around compact objects and around close binaries. He finds that Ra for polytropic discs can be up to an order of magnitude larger, depending on the polytropic index, the viscosity parameter and the precession mechanism. There is little change in the earlier conclusion that the case for alignment in Her X-1 is marginal, while there is substantial alignment in ɛ Aur. A lower limit is put on α for isothermal discs, which is expected to hold for polytropic discs as well. A bound is put on the energy of the perturbed flows.

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