CW Mon: January outburst showing multiple periodic modulations
H. Itoh detected an outburst of CW Mon at 13.4mag on January 3
(vsnet-alert 3952,
vsnet-alert 3953).
The last outburst ocurred in 1999 February 10 at 13.6mag detected
by R. Stubbings
(vsnet-alert 3958).
T. Vanmunster performed a 3.6-hour run during the outburst.
The light curve clearly showed a (complex) combination of periodic
modulations (0.051 d, 0.081 d, ...). The data is available at:
[vsnet-alert 3963].
Using T. Vanmunster's data, E. Broens suggested the other candidates
of periods of 0.028 d (40 min) and 0.100 d (2.4 h)
(vsnet-alert 3973).
W. S. G. Walker performed 5.5 hours run on January 8 and reported
there are eclipses ~0.4 mags depth at 2000 Jan 08.40231 and Jan 08.57692
(vsnet-alert 3975),
and he posted the data set to
vsnet-alert 3976.
L. Cook combined these data including his own data set, and
perform PDM period analysis which yielded a period-power diagram
available at:
http://www.geocities.com/lcoo/cwmon3.jpg,
and the data was posted at:
http://www.geocities.com/lcoo/CW551coo.txt
(vsnet-alert 3977).
Using the Lancelot method on Vanmunsters observations, M. Martignoni
found similar results obtained by E. Broens: 0.0264 d (38 min.),
0.0528 d (2 times the base period), 0.0766 (3 times?) and 0.1041 d,
and on Walker observations, found 0.0236 d (34 min.) in good agreement
with results on Vanmunster data
(vsnet-alert 3985,
vsnet-alert 3990).