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

[Michael Armstrong]

All,
I can confirm Tonny's findings.  Due to some hardware issues, I was
unable to reduce my data from this past weekend until just a short while
ago.

I started a multiband time-series (BVRIc) on ASAS 023322-1047 at 22 Jan
02:24 UT.  Using a 0.25-m f/6 with ST7XME camera at my location in
Phoenix, Arizona.  The V band data, spanning 2 hours and 18 minutes,
shows a weak periodic signal with a period that closely matches that
reported by Tonny.  Using Peranso (Cleanest), yielded a period of 0.052
d and and amplitude of 0.05 mag.  

My data will be uploaded to AAVSO, this evening.

Mike AMN  



On Tue, 2006-01-24 at 00:28 +0100, Tonny Vanmunster wrote:
> 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
> 
> 
> 
> 
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