Discovery and photometric study of the new in-the-gap SU UMa Dwarf Nova Var 73 Dra

¹ Sternberg Astronomical Institute (SAI), 13, University Ave., Moscow 119992, Russia and Isaac Newton Institute of Chile, Moscow Branch, Russia e-mail: antipin@sai.msu.ru
² Crimean Astrophysical Observatory, Nauchny, 98409 Crimea, Ukraine and Isaac Newton Institute of Chile, Crimean Branch, Ukraine e-mail: pavlenko@crao.crimea.ua

Corresponding author: E. P. Pavlenko, pavlenko@crao.crimea.ua

Received: 19 April 2002
Accepted: 6 May 2002

Abstract

We present the discovery and the first investigation of the new dwarf nova Var 73 Dra. We carried out monitoring and time-resolved CCD observations in 2001 August–October and detected several normal outbursts with a recurrence time of about 7–8 days and one slightly brighter superoutburst with a “plateau” phase that lasted 13 days. Our photometry during the superoutburst clearly shows the presence of superhumps with the period 0.0954 () day (although the one-day alias period, 0.1053 d, could not be ruled out). So, the observed features allow us to classify Var 73 Dra as a new SU UMa-type dwarf nova within the well-known gap of orbital period distribution of cataclysmic variables.