[vsnet-campaign-dn 2857] RX J0558.3+6753 long outburst: photometry on Sep. 14

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

RX J0558.3+6753 long outburst: photometry on Sep. 14

Dear Colleagues,

   We have received time-series observations (2-3 hours each) on Sep. 14
from Arto Oksanen (observer Petri Tikkanen), Ondrej Pejcha and
Tonny Vanmunster.  A preliminary look at the combined light curve did not
show clear evidence of superhumps larger than 0.1 mag.  However, there is
evidence of 0.05 mag variation (time scales 30-60 min) in Tikkanen's data,
whose nature needs to be further examined.  Although the present observation
suggests the SS Cyg-type classification, further observation would be
helpful in clearly determining the classification.

Regards,
Taichi Kato
VSNET Collaboration team

==

   Comment from the Nyrola team:

Here is our dataset of RXJ0558.3+6753 run from Nyrola. The star is bright
CR=14.6, but does not show superhumps or they are very small amplitude.
Only fading trend about 1 mag per day is evident on the light curve.

Unfiltered 60s exposures with 0.40 m SCT + ST7E CCD.

Observation timespan Sep 13 20:22 - 22:54 UT. High humidity and
condensing problems towards the end of run.

The reference star (C) is the R=12.54 GSC2.2 star N3102000421 south of
variable. The check star (K) is GSC 4344:1248.

Lightcurve:
http://nyrola.jklsirius.fi/ccd/2002/data0913/RXJ0558_20020913.jpg

Observer: Petri Tikkanen

best regards,

arto

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