New solution to viscous evolution of accretion disks in binary systems

Details New solution to viscous evolution of accretion disks in binary systems New solution to viscous evolution of accretion disks in binary systems

2001-03-17

arxiv.org/abs/astro-ph/0103274v3

Astron.Astrophys.356:363-372,2000

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, typos are corrected in formulae (17),(26),(29),(31),(34),(46)

Scientific paper

Analytical investigation of time-dependent accretion in disks is carried out. We consider a time-dependent disk in a binary system at outburst which has a fixed tidally-truncated outer radius. The standard Shakura-Sunyaev model of the disk is considered. The vertical structure of the disk is accurately described in two regimes of opacity: Thomson and free-free. Fully analytical solutions are obtained, characterized by power-law variations of accretion rate with time. The solutions supply asymptotic description of disk evolution in flaring sources in the periods after outbursts while the disk is fully ionized. The X-ray flux of multicolor (black-body) alpha-disk is obtained as varying quasi-exponentially. Application to X-ray novae is briefly discussed concerning the observed faster-than-power decays of X-ray light curves. The case of time-dependent advective disk when the exponential variations of accretion rate can occur is discussed.

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