▁system ▁appears ▁as ▁a ▁late ▁O ▁class ▁star , ▁but ▁is ▁actually ▁made ▁up ▁of ▁three ▁stars . ▁ ▁The ▁inner ▁pair ▁complete ▁a ▁highly ▁ecc ent ric ▁orbit ▁every ▁ 1 4 3 ▁days , ▁while ▁the ▁outer ▁star ▁comple tes ▁its ▁near - circ ular ▁orbit ▁once ▁every ▁ 1 5 7 ▁years . ▁ ▁It ▁has ▁not ▁yet ▁completed ▁a ▁full ▁orbit ▁since ▁it ▁was ▁first ▁discovered ▁to ▁be ▁a ▁double ▁star . ▁ ▁All ▁three ▁are ▁very ▁young ▁main ▁sequence ▁stars ▁with ▁masses ▁between ▁. ▁ ▁Com ponents ▁The ▁primary ▁component ▁A a ▁is ▁the ▁class ▁O 9 . 5 ▁star , ▁with ▁a ▁temperature ▁of ▁ 3 5 , 0 0 0 ▁K ▁and ▁a ▁lum inos ity ▁over ▁. ▁L ines ▁representing ▁a ▁B 0 . 5 ▁main ▁sequence ▁star ▁have ▁been ▁shown ▁to ▁belong ▁to ▁its ▁close ▁companion ▁Ab , ▁which ▁has ▁a ▁temperature ▁of ▁ 3 1 , 0 0 0 ▁K ▁and ▁a ▁lum inos ity ▁of ▁. ▁Their ▁separation ▁var ies ▁from ▁less ▁than ▁half ▁an ▁astronom ical ▁unit ▁to ▁around ▁two ▁A U . ▁Although ▁they ▁cannot ▁be ▁directly ▁im aged ▁with ▁conventional ▁single ▁mirror ▁teles cop es , ▁their ▁respective ▁visual ▁magn itudes ▁have ▁been ▁calculated ▁at ▁ 4 . 6 1 ▁and ▁ 5 . 2 0 . ▁The ▁two ▁components ▁of ▁ σ ▁Or ion is ▁A ▁have ▁been ▁resolved ▁inter fer omet r ically ▁using ▁the ▁CHAR A ▁array , ▁and ▁the ▁combination ▁of ▁inter fer ometric ▁and