Spiral waves in accretion discs：（螺旋波在吸积盘）.pdfVIP

The Physics of Cataclysmic Variables and Related Objects ASP Conference Series, Vol. XXX, 2002 B.T. G¨ansicke, K. Beuermann, K. Reinsch Spiral waves in accretion discs H.M.J. Boffin Royal Observatory of Belgium, 3 av. Circulaire, 1180 Brussels 1 0 D. Steeghs 0 Physics Astronomy, Southampton University, Southampton SO17 2 1BJ, UK t c O Abstract. In the first part of this article, we review the observational 9 evidence for spirals in the accretion discs of cataclysmic variables. It is shown that with the increasing amount of data available, spirals appear to 1 be an omnipresent feature of accretion discs in outburst. Spirals seem to v live until decline that is, for several tens of orbital periods. We then study 7 the formation of spiral shocks from a theoretical side, using the results 9 1 of various numerical simulations. We make a comparison between obser- 0 vations and theory and briefly discuss the implications of the presence of 1 spirals in the discs of cataclysmic variables. 1 0 / h p - o 1. Introduction r t s In close binaries, it is the detailed process of angular momentum transport that a determines the structure of the accretion disc and therefore the rate at which : v gas, supplied from the mass donor, is actually accreted by the compact ob- i X ject. Although so fundamental to the process of accretion through discs,