Аннотация:Among the accreting pulsators that have experienced a dwarf novae outburst,
SDSS J080434.20+510349.2 has the most dramatic history of events within a short time
scale: the 2006 outburst with 11 rebrightenings, series of December 2006 – January 2007
mini-outbursts, the 2010 outburst with 6 rebrightenings. Over 2006–2011, in addition to
positive 0.060-d superhumps during the superoutburst and 1-month post-outburst stage,
0.059005-d orbital humps in quiescence, it displayed the periods of P1 = 12:6 min,
P2 = 21:7min, P3 = 14:1 min and P4 = 4:28 min. The 12.6-min non-radial pulsations
of the WD first appeared 7 months after the 2006 outburst and was the most prominent one
during the following 900 days. They varied within a range of 36 s, and amplitude changed
from 0:013m to 0:03m. Simultaneously there were the less significant 21.7-min and 14.3-min
periodicities. During the minioutbursts the 21.7-min periodicity became the most powerful
while the 12.6-min one was less powerful. After the 2011 outburst the most prominent shortterm
periodicity appeared 7 months after the outburst, but at 4.28 min. We identified that
variability with periods P2, P3 and P4 could be additional pulsation modes.
