It was classified as K0ep Ia from a 1949 spectrum, but also recognised to have a small hot companion, plus an unusual infrared excess. Ultraviolet spectra allowed absorption lines from the companion to be studied and it was given a spectral type of B0-1.
The object was initially identified as K0ep Ia based on its 1949 spectrum, but it was also discovered to have a small, hot companion, along with an unusual infrared emission. The analysis of ultraviolet spectra enabled the examination of absorption lines from the companion, leading to its classification as B0-1.