Magnitudes of Bremsstrahlung and Cyclotron Cooling From on-Axis Accretion Shocks onto AM-Her Systems

Abstract

The article presents a calculation of relative phases and relative magnitudes for bremsstrahlung and cyclotron emissions fromradiative accretion shocks onto binary Magnetic CVs (AM-Her systems). The calculation is carried out for a 0.3 solar mass white dwarf primary star, having a field B*=30MG , and accretion rate of  L_acc = 3.2x10 L^-3 L_Edd. Here Edd L is the Eddington accretion luminosity. Individual on-axis accretion funnels are investigated corresponding to large radii at which field lines strike the equatorial plane
(a_o ≡ r_eq/R_* = 500, 300, 300, 200, 150, 100 and 80). Results show a relatively low level cyclotron cooling, and thus permit decoupling.

Keywords: AM-Her systems; Accretion shocks; Oscillations; Cyclotron cooling; Decoupling.