The Gravitational Radius of an Irradiated Disk

Publications of the Astronomical Society of Australia

Kurt Liffman¹ 

关键词: accretion disks;    hydrodynamics;    circumstellar matter;    stars: winds;    outflows;   

DOI  :  10.1071/AS03019

学科分类：天文学(综合)

来源: CSIRO

【 摘 要 】

We derive an updated, analytic formula for the gravitational radius, rg, of an irradiated, thin disk. For such a disk, the region outside the gravitational radius will produce a thermal wind, while the region interior to the gravitational radius will be stable. We find that rg ≈ 1.4 (M*/M⊙)/(T0/104K) AU. The value of 1.4 AU is approximately one fifth of currently used values.The analysis uses the adiabatic approximation. We argue that the same formula applies for the non-adiabatic, isothermal case.

【 授权许可】

Unknown