Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460405c&link_type=abstract
American Astronomical Society, AAS Meeting #214, #604.05
Astronomy and Astrophysics
Astronomy
1
Scientific paper
Massive stars produce so much light that the spherically averaged radiation pressure exerted on the gas and dust around them is stronger than their gravitational attraction, a condition that has long been expected to prevent them from growing by accretion. We
present three-dimensional adiation-hydrodynamic simulations of the collapse of a massive prestellar core which include the effect of protostellar outflow feedback on the parent core. We find that radiation pressure does not halt accretion. Instead, the outflow
evacuates a cavity of reduced optical depth through the parent core by unbinding greater than 50% of the mass of the initial system. The cavity sculpts an anisotropic radiation field which greatly reduces the radiation force exerted on the infalling gas, allowing accretion to continue through the disk onto the central protostar. Gravitational instabilities cause fragmentation of the the equatorial accretion disk and the formation of a massive companion to the primary star. Radiation pressure therefore does not limit stellar masses and high mass star formation can occur via accretion onto small multiple systems. This work performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. LLNL-ABS-411224.
Cunningham Andrew
Klein Richard I.
Krumholz Mark R.
McKee Christopher F.
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