Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202..183f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Jan. 1983, p. 183-199.
Astronomy and Astrophysics
Astronomy
26
Equipartition Theorem, Stellar Envelopes, Stellar Mass Accretion, White Dwarf Stars, X Ray Sources, Conductive Heat Transfer, Magnetic Stars, Magnetohydrodynamic Flow, Radial Flow, Radiative Transfer, Shock Heating, Stellar Temperature, Two Fluid Models
Scientific paper
The global behavior of all accretion column solutions in which the accreting matter reaches equipartition at moderate temperatures before landing on the white dwarf is studied. These divide into two classes, depending on whether the conductive flux increases monotonically as the temperature drops, becoming large before the conduction 'saturates', (type 1), or whether the conductive flux always remains small (type 2). Type 2 solutions reach a temperature minimum and can be matched to a 'sinking' white dwarf atmosphere in radiative equilibrium, while type 1 solutions cannot; a unique solution to the one-fluid accretion problem is thus found by requiring that the outward radiative flux through this atmosphere should be supplied by the absorption of hard X-rays from the type 2 accretion column plus any intrinsic flux which the white dwarf possesses. The resulting column structures fail as before to predict the correct soft to hard X-rays ratios; it is concluded that equipartition flows do not provide a good description of accretion in at least the AM Herculis systems.
Frank Jacki
King Andrew R.
Lasota Jean-Pierre
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