The Be star o Cas is indeed the primary of a triple system

Open Access

Fig. 5.

The disentangled line profiles of the He I 4471 Å, and Mg II 4481 Å line for the three components of the triple system. All profiles are normalised to the joint continuum of the whole system and the profiles of the primary and secondary of the $11 \overset{d}{.} 66$ $Mathematical equation: $ 11{{\overset{\text{d}}{.}}}66 $$ subsystem were shifted for 0.04, and 0.02, respectively, in relative flux.

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