Perturbation Growing in the Main Accretion Phase

Details Perturbation Growing in the Main Accretion Phase Perturbation Growing in the Main Accretion Phase

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...558..753h&link_type=abstract

The Astrophysical Journal, Volume 558, Issue 2, pp. 753-760.

Astronomy and Astrophysics

Astronomy

Stars: Binaries: General, Gravitation, Hydrodynamics, Instabilities, Stars: Formation

Scientific paper

We investigate the growth of the bar mode during the main accretion phase of protostar formation. Our stability analysis shows that the bar mode grows both in the pre-protostellar phase, and in the main accretion phase. The perturbation has a larger amplitude at a smaller radius in the main accretion phase. The perturbation propagates outward to have a large amplitude at a large distance at a later stage. The growth during the main accretion phase makes the envelope nonspherical. Thus, the accretion onto the protostar becomes nonspherical at a later stage. The nonspherical accretion may enhance formation of multiple stars. We also show the application of our stability analysis to the spin-up of the protostar and to its infalling envelope.

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