Accretion disc outbursts: a new version of an old model

Details Accretion disc outbursts: a new version of an old model Accretion disc outbursts: a new version of an old model

1998-03-20

arxiv.org/abs/astro-ph/9803242v1

Astronomy and Astrophysics

Astrophysics

13 pages, 12 figures; accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01773.x

We have developed 1D time-dependent numerical models of accretion discs, using an adaptive grid technique and an implicit numerical scheme, in which the disc size is allowed to vary with time. The code fully resolves the cooling and heating fronts propagating in the disc. We show that models in which the radius of the outer edge of the disc is fixed produce incorrect results, from which probably incorrect conclusions about the viscosity law have been inferred. In particular we show that outside-in outbursts are possible when a standard bimodal behaviour of the Shakura-Sunyaev viscosity parameter alpha is used. We also discuss to what extent insufficient grid resolutions have limited the predictive power of previous models. We find that the global properties (magnitudes, etc. ...) of transient discs can be addressed by codes using a high, but reasonable, number of fixed grid points. However, the study of the detailed physical properties of the transition fronts generally requires resolutions which are out of reach of fixed grid codes. It appears that most time-dependent models of accretion discs published in the literature have been limited by resolution effects, improper outer boundary conditions, or both.

Affiliated with

Also associated with

No associations

Rating

Accretion disc outbursts: a new version of an old model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Accretion disc outbursts: a new version of an old model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Accretion disc outbursts: a new version of an old model will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-343845