Other
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994stin...0147002h&link_type=abstract
Conference Paper, NASA Ames Research Center Moffett Field, CA United States
Other
Evaporation, Accretion Disks, Massive Stars, Luminosity, Photons, Continuums, Hydrogen Recombinations, Losses, H Ii Regions, Ground State
Scientific paper
Young massive stars produce sufficient Lyman continuum luminosity phi to have a significant effect on the structure and evolution of the accretion disks surrounding diem. We show that inside a critical disk radius rg, an isothermal 104 K atmosphere forms with a scale height that increases with r(sup3/2) for r less than or equal to rg. For r less than or equal to rg, the diffuse field caused by hydrogen recombinations to the ground state in the atmosphere produces a steadily evaporating disk. The mass loss from this outer region of the disk is of order 10-5 Mo/yr phi491/2, where phi49 is defined as phi/1049 photons/s. The mass loss has two important consequences. First, the slow (10-50 km/s) wind that results may explain the long life of unresolved ultracompact HII regions. Secondly, the dependence on phi implies that accretion through the disk onto the star will be quenched once the photoevaporation rate exceeds the accretion rate. This may act to limit the mass of the forming star.
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