2 ▁magn itudes . ▁It ▁retained ▁the ▁same ▁magnitude ▁until ▁the ▁er u ption , ▁showing ▁a ▁variation ▁of ▁ 0 . 9 ▁magn itudes . ▁Thus ▁it ▁did ▁not ▁show ▁a ▁pre - er u ption ▁rise ▁in ▁bright ness . ▁ ▁This ▁is ▁an ▁interact ing ▁binary ▁star ▁system ▁consisting ▁of ▁a ▁white ▁d war f ▁primary ▁star ▁and ▁a ▁main ▁sequence ▁star ▁with ▁a ▁stell ar ▁classification ▁of ▁G 8 V . ▁The ▁orbit ▁has ▁a ▁period ▁of ▁ 0 . 3 3 3 8 1 3 7 9 ▁days ▁and ▁an ▁incl ination ▁of ▁ 8 8 . 2 ° ▁to ▁the ▁line ▁of ▁sight ▁to ▁the ▁Earth , ▁resulting ▁in ▁an ▁e cli ps ing ▁binary . ▁The ▁nova ▁er u ption ▁is ▁believed ▁to ▁have ▁been ▁driven ▁by ▁mass ▁transferred ▁from ▁the ▁secondary ▁star ▁to ▁the ▁white ▁d war f . ▁It ▁remains ▁uncertain ▁whether ▁the ▁white ▁d war f ▁has ▁an ▁acc ret ion ▁disk ▁formed ▁by ▁this ▁material . ▁M atter ▁out flow ing ▁from ▁the ▁system ▁has ▁a ▁line ▁of ▁sight ▁velocity ▁of ▁ 4 5 0   km ▁s − 1 , ▁but ▁ ▁may ▁be ▁moving ▁at ▁up ▁to ▁ 3 , 2 0 0   km ▁s − 1 ▁if ▁the ▁flow ▁is ▁strictly ▁b ip olar . ▁ ▁References ▁ ▁External ▁links ▁ ▁https :// web . archive . org / web / 2 0 0 5 0 9 0 5 1 6 3 2 1 5 / http ://