1 research outputs found
Modelling the Recurrent Nova CI Aql in Quiescence
We present detailed photometric investigations of the recurrent nova CI Aql.
New data obtained after the 2000 outburst are used to derive a 3D geometrical
model of the system. The resulting light curves clearly indicate the existence
of an asymmetric spray around the accretion disk, as claimed in the past e.g.
for the super-soft X-ray source CAL87 in the LMC. The simulated light curves
give us the mass transfer rates varying from \dot M ~ 2.5 x 10^{-8} M_\odot /
yr in 1991-1996 to 5.5 x 10^{-8} < \dot M < 1.5 x 10^{-7}M_\odot / yr in
2001/2002. The distance and the interstellar foreground extinction resulting
from the model are 1.55 kpc and E(B-V) = 0.98 respectively. During fast
photometry sequences in 2002 short timescale variations (t ~ 13 minutes) of the
mass loss are found. Moreover a change in the orbital period of the system is
detectable and results in a mass loss of 2.2 x 10^{-6} < \Delta M < 5.7 x
10^{-6} M_\odot during the nova explosion.Comment: 9 pages 14 eps figures, to appear in Astron. & Astrophy