Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-21
Mon.Not.Roy.Astron.Soc. 347 (2004) 873
Astronomy and Astrophysics
Astrophysics
13 pages, 7 figures, accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2004.07288.x
We argue that the outbursts of the FU Orionis stars occur on timescales which are much longer than expected from the standard disc instability model with \alpha_{c} \gtrsim 10^{-3}. The outburst, recurrence, and rise times are consistent with the idea that the accretion disc in these objects is truncated at a radius R_{i} \sim 40 \rsun. In agreement with a number of previous authors we suggest that the inner regions of the accretion discs in FU Ori objects are evacuated by the action of a magnetic propeller anchored on the central star. We develop an analytic solution for the steady state structure of an accretion disc in the presence of a central magnetic torque, and present numerical calculations to follow its time evolution. These calculations confirm that a recurrence time that is consistent with observations can be obtained by selecting appropriate values for viscosity and magnetic field strength.
Matthews O. M.
Speith Roland
Wynn Graham A.
No associations
LandOfFree
Outbursts of Young Stellar Objects 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 Outbursts of Young Stellar Objects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Outbursts of Young Stellar Objects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-509447