[vsnet-alert 5966] V478 Her : very likely a new UGSU type dwarf nova near the upper limit of the period gap

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Dear colleagues,

On June 8th, 2001, the night was very clear over CBA Belgium Observatory, so
we decided to start an all-night long photometry session on V478 Her. The
resulting light curve covers about 3.7 hours and is presented on my web site
www.lunarpages.com/cbabelgium. It clearly shows a 0.33-mag modulation, that
very likely is to be attributed to superhumps, thus classifying V478 Her as
a new member of the UGSU-type dwarf novae. Due to the short nights in
Belgium, during this period of the year, we could not follow the variable
for a longer duration, but we hope that contributions from other
observatories will help in securing the classification of the variable.

Using Stellingwerf's PDM algorithm, we derived a preliminary superhump
period value of 0.129 +/- 0.005 d or about 3.1 hours. This puts V478 Her
near the upper limits of the so called 'period gap'.


Tonny Vanmunster
CBA Belgium Observatory
http://vsnet.lunarpages.com/cbabelgium
email : Tonny.Vanmunster@advalvas.be

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