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[vsnet-outburst 2377] V478 Her : very likely a new UGSU type dwarf nova near the upper limit of the period gap
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
vsnet-adm@kusastro.kyoto-u.ac.jp
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