▁be ▁further ▁away ▁and ▁older ▁than ▁the ▁other ▁members ▁of ▁the ▁cluster , ▁from ▁mod elling ▁its ▁evolution ary ▁age ▁and ▁size . ▁▁ σ ▁Ori ▁E ▁has ▁a ▁faint ▁companion ▁about ▁a ▁third ▁of ▁an ▁arc - second ▁away . ▁ ▁It ▁is ▁about ▁ 5 ▁magn itudes ▁f ain ter ▁than ▁the ▁hel ium - rich ▁primary , ▁about ▁magnitude ▁ 1 0 - 1 1 ▁at ▁K ▁band ▁inf ra red ▁w avel ength s . ▁ ▁It ▁is ▁pres umed ▁to ▁be ▁a ▁low ▁mass ▁star ▁. ▁▁ σ ▁Or ion is ▁I RS 1 ▁The ▁inf ra red ▁source ▁I RS 1 ▁is ▁close ▁to ▁ σ ▁Ori ▁A . ▁ ▁It ▁has ▁been ▁resolved ▁to ▁a ▁pair ▁of ▁low ▁mass ▁objects , ▁a ▁prop ly d , ▁and ▁a ▁possible ▁third ▁object . ▁ ▁The ▁br ighter ▁object ▁has ▁an ▁M 1 ▁spectral ▁class , ▁a ▁mass ▁around ▁, ▁and ▁appears ▁to ▁be ▁a ▁relatively ▁normal ▁low ▁mass ▁star . ▁ ▁The ▁f ain ter ▁object ▁is ▁very ▁unusual , ▁showing ▁a ▁dil uted ▁M 7 ▁or ▁M 8 ▁absor ption ▁spectrum ▁with ▁emission ▁lines ▁of ▁hydro gen ▁and ▁hel ium . ▁ ▁The ▁interpretation ▁is ▁that ▁it ▁is ▁a ▁brown ▁d war f ▁embedded ▁within ▁a ▁prop ly d ▁that ▁is ▁being ▁photo ev apor ated ▁by ▁ σ ▁Ori ▁A . ▁ ▁X - ray ▁emission ▁from ▁I RS 1 ▁suggests ▁the ▁presence ▁of ▁an ▁acc ret ion ▁disc ▁around ▁a ▁T ▁Ta uri ▁star