Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..475s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 2, March 1990, p. 475-493.
Astronomy and Astrophysics
Astrophysics
69
Accretion Disks, Magnetic Field Configurations, Mass Transfer, Neutron Stars, Stellar Magnetospheres, Emission Spectra, Energy Sources, Kepler Laws, X Ray Binaries
Scientific paper
The interaction between a thin Keplerian accretion disk and a magnetosphere surrounding a central object is investigated within the framework of an analytical description for the magnetic field configuration. The commonly held assumption that all accreting plasma flows from the magnetospheric boundary to the stellar surface is shown to be overly restrictive. If the magnetospheric boundary is defined as the distance where the rotation starts deviating significantly from the Kepler rate, it is found that there is an extensive region inside this boundary where gas, nearly corotating with the star, drifts inward across the field by an interchange instability. The linear analysis of this instability is presented. It is also found that gas tied to field lines can be in equilibrium at positions off the midplane, and that gas can plausibly flow from the midplane to these positions, in certain circumstances. The observational consequences of such a picture are briefly discussed.
Spruit Hendrik C.
Taam Ronald E.
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