Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cajph..64..514t&link_type=abstract
(Conference on Jets from Stars and Galaxies, Toronto, Canada, June 24-27, 1985) Canadian Journal of Physics (ISSN 0008-4204), vo
Astronomy and Astrophysics
Astronomy
8
Acceleration (Physics), Accretion Disks, Protostars, Radio Jets (Astronomy), Stellar Mass Ejection, Stellar Winds, Astronomical Models, Cataclysmic Variables, Molecular Flow, Pre-Main Sequence Stars, White Dwarf Stars
Scientific paper
A general mechanism is presented for generating pressure-driven winds, which are intrinsically bipolar, from objects undergoing disk accretion. The energy liberated in a boundary-layer shock as disk matter impacts the central object makes the vertical density structure of the boundary layer go out of hydrostatic equilibrium by large factors. The resultant expansion in the direction of the density gradient, i.e., perpendicular to the disk, converts accretion energy into P dV work and is shown to be capable of ejecting a fraction 0.01-0.1 of the accreted mass from the system. The ejection of these flows, accelerated within one solar radius, can account for the jets observed from pre-main-sequence stars and cataclysmic variables. Unless an analogous boundary-layer shock develops during accretion onto massive black holes, however, this mechanism does not seem to be applicable to jets from galaxies.
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