| Photoevaporation Of Disks And Clumps By Nearby Massive Stars : Application To Disk Destruction In The Orion Nebula (2007) | |||||||||||||
Abstract | |||||||||||||
| We present a model for the photoevaporation of circumstellar disks or dense clumps of gas by an external source of ultraviolet radiation. Our model includes the thermal and dynamic e+ects of 613.6 eV far-ultraviolet (FUV) photons and Lyman continuum EUV photons incident upon disks or clumps idealized as spheres of radius and enclosed mass For sufficiently large values of the radiation r d M * . r d /M * , eld evaporates the surface gas and dust. Analytical and numerical approximations to the resulting ows are presented ; the model depends on the ux of FUV and EUV photons, and the column r d , M * , density of neutral gas heated by FUV photons to high temperatures. Application of this model shows that the circumstellar disks cm) in the Orion Nebula ("" proplyds ) are rapidly destroyed (r d D 10141015 by the external UV radiation eld. Close cm) to h1 Ori C, the ionizing EUV photon ux controls the mass-loss rate, and the (d [ 1017 ionization front (IF) is approximately coincident... | |||||||||||||
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