Hydrodynamic ejection of bipolar flows from objects undergoing disk accretion - T Tauri stars, massive pre-main-sequence objects, and cataclysmic variables

Details Hydrodynamic ejection of bipolar flows from objects undergoing disk accretion - T Tauri stars, massive pre-main-sequence objects, and cataclysmic variables Hydrodynamic ejection of bipolar flows from objects undergoing disk accretion - T Tauri stars, massive pre-main-sequence objects, and cataclysmic variables

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..318t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 318-325. Research supported by the University of Tex

Astronomy and Astrophysics

Astrophysics

71

Accretion Disks, Pre-Main Sequence Stars, Stellar Mass Ejection, T Tauri Stars, Collimation, Neutron Stars, Polarization (Waves), Stellar Evolution, Stellar Winds, Variable Stars

Scientific paper

A general mechanism is presented for generating pressure-driven winds that are intrinsically bipolar from objects undergoing disk accretion. The energy liberated in a boundary layer shock as the disk matter impacts the central object is shown to be sufficient to eject a fraction beta approximately 0.01 to 0.001 of the accreted mass. These winds are driven by a mechanism that accelerates the flow perpendicular to the plane of the disk and can therefore account for the bipolar geometry of the mass loss observed near young stars. The mass loss contained in these winds is comparable to that inferred for young stars. Thus, disk accretion-driven winds may constitute the T Tauri phase of stellar evolution. This mechanism is generally applicable, and thus massive pre-main-sequence objects, as well as cataclysmic variables at times of enhanced accretion are predicted to eject bipolar outflows as well. Unmagnetized accreting neutron stars are also expected to eject bipolar flows. Since this mechanism requires stellar surfaces, however, it will not operate in disk accretion onto black holes.

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