[Aavso-photometry] Var Vul 05 (New var near M27) is a new UGSU-type variable

[Tonny Vanmunster]

Dear colleagues,

I have just completed a detailed analysis of my Var Vul 05 observations from
last night (2005, Aug 23/24). The data were obtained under medium quality
sky conditions at CBA Belgium Observatory, using a 0.35-m f/6.3 telescope
and (unfiltered) ST-7XME CCD camera. The session effectively started at Aug
23.85 UT and lasted for 4.4 hours (more images were obtained before and
after, but with insufficient S/N level).

Instead of stacking the images (which I first did - see my message of this
morning), I now processed the individual images, resulting in a total of 117
useful observations. The resulting light curve now shows a clear superhump
profile. I used a number of different period analysis methods in Peranso
(ANOVA, Lomb-Scargle, PDM, CLEANest) and they all show a strong signal at
0.058 +/- 0.003 d. The corresponding phase diagram shows a convincing
superhump profile. Hence, it is safe to conclude that this object is a new
UGSU-type dwarf nova (and maybe even an UGWZ-type dwarf nova). The superhump
amplitude is about 0.3 mag.

I have published the light curve, period analysis diagram and phase diagram
on my web site (www.cbabelgium.com) for further reference.

Follow-up time-resolved CCD photometry is strongly encouraged.

Best regards,
Tonny Vanmunster

Tonny Vanmunster
CBA Belgium Observatory
http://www.cbabelgium.com 
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PERANSO : The Final Frontier of Period Analysis Software
http://www.peranso.com
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