▁a ▁disc ▁of ▁material ▁being ▁stri pped ▁from ▁the ▁primary ▁and ▁transfer ring ▁material ▁to ▁the ▁secondary , ▁but ▁no ▁e cli ps es ▁ ▁The ▁system ▁is ▁class ified ▁as ▁a ▁single - lined ▁spect ro scop ic ▁binary , ▁but ▁high ▁exc itation ▁lines ▁from ▁the ▁secondary ▁can ▁be ▁detected ▁in ▁the ▁ult rav io let . ▁ ▁Rad ial ▁velocity ▁variations ▁were ▁discovered ▁in ▁ 1 8 9 9 , ▁ ▁The ▁first ▁orbit ▁was ▁calculated ▁in ▁ 1 9 1 4 , ▁reason ably ▁close ▁to ▁modern ▁understanding ▁of ▁the ▁system . ▁ ▁Properties ▁The ▁primary ▁component , ▁ υ ▁S ag itt ari i 1 , ▁appears ▁as ▁an ▁A ▁type ▁super gi ant , ▁although ▁published ▁spectral ▁types ▁vary ▁from ▁F 2 p ▁to ▁B 5 II . ▁ ▁Con tr ast ing ▁components ▁in ▁the ▁spectrum ▁may ▁origin ate ▁from ▁disc ▁material , ▁polar ▁j ets , ▁or ▁the ▁star ▁itself . ▁ ▁The ▁low ▁mass ▁and ▁unusual ▁chemical ▁composition ▁are ▁also ▁thought ▁to ▁produce ▁mis leading ▁spectral ▁cal ibr ations , ▁with ▁the ▁star ▁not ▁as ▁massive ▁or ▁as ▁l umin ous ▁as ▁the ▁I a ▁lum inos ity ▁class ▁would ▁suggest . ▁▁ υ ▁S gr 1 ▁is ▁a ▁hel ium ▁star , ▁almost ▁entirely ▁def ic ient ▁of ▁hydro gen . ▁ ▁It ▁has ▁also ▁been ▁described ▁as ▁a ▁ne on ▁star , ▁due ▁to ▁the ▁very ▁high ▁relative ▁levels ▁of ▁that ▁element . ▁ ▁It ▁has ▁been ▁stri pped ▁of ▁its ▁outer