Statistics – Computation
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998baas...30..766p&link_type=abstract
American Astronomical Society Meeting, 191, #129.05
Statistics
Computation
Scientific paper
We have developed one-dimensional isothermal analytic hydrodynamic models, both one-dimensional and two-dimensional isothermal numerical hydrodynamic models, and two-dimensional adiabatic alpha disk numerical models for line-driven accretion disk winds from cataclysmic variable (CV) systems. Using the one-dimensional analytic models we explore the physical conditions necessary for the existence of a disk wind, and study the dependence of wind speed and mass-loss rate on radius. Using the two-dimensional isothermal model we explore the effects of centrifugal forces in the wind, and show that these forces cause the wind stream lines to collide producing enhanced density regions in the disk wind. If these effects were absent, the mass-loss rates obtained would be too low to produce the optical depths required to explain the P Cygni profile of CVs. Thus we show the necessity of two-dimensional models where these forces may be represented. Using the two-dimensional adiabatic alpha disk model we calculate wind mass-loss rates, terminal velocities, and line profiles for CIV (1550 Angstroms) for various angles. For disk luminosity Ldisk=L_&sun;, white dwarf mass Mwd=0.6M_&sun;, and white dwarf radii Rwd=0.01R_&sun;, we obtain a wind mass-loss rate of dot Mwind=8 x 10(-12) M_&sun; yr(-1) , and a terminal velocity of ~ 3000 ;km ;s(-1) . The line profiles we obtain through our computational model are consistent with observations in their general form, in particular in the maximum absorption at roughly half the terminal velocity for the blue-shifted component, in the magnitudes of the wind velocities implied by the absorption components, in the FWHM of the emission components, and in the strong dependence in inclination angle. Recently we have also included local ionization equilibrium obtaining similar results.
Blondin John M.
Kallman Tim R.
Pereyra Nicolas Antonio
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