[Aavso-photometry] ASAS 023322-1047.0 - weak possibly periodic signal (2006 Jan 23/24, CBA Belgium Observatory)

[Tonny Vanmunster]

Dear colleagues,

I started a time-series (unfiltered) CCD photometry session on ASAS
023322-1047.0, at Jan 23.72 UT, using a 0.35-m f/6.3 telescope and ST-7XME
camera of CBA Belgium Observatory. The session lasted for 3.6 hours, and
shows the presence of a weak possibly periodic signal, that *might* indicate
the emergence of early superhumps, although still very unsure at this
moment. The light curve has been made available at my website
http://www.cbabelgium.com, after having removed a linear trend of decline.
 
A period analysis using Peranso's ANOVA method, yields a period of 0.055 +/-
0.005 d, with an amplitude of about 0.1 mag. If this signal relates to early
superhumps, it would be amongst the shortest presently known. The object
faded by approx. 0.04 mag over the course of my session. A period
significance analysis, using a Fisher Randomization Test (with 200 Monte
Carlo permutations), yields a false alarm probability close to 0%, hence
indicating that the above signal is quite likely secure. 

Evidently, follow-up observations are required over the next nights to
further study the behaviour of this variable and to determine its precise
nature. 
More details about my session are available at my website.

Kind regards,
Tonny


Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com 
 
PERANSO : The Light Curve and Period Analysis Software
http://www.peranso.com