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Individual sheet: WR133
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Spectral type(s): WN5 + O9I
Multiplicity:
Confirmed binary system, potential triple system
Period(s): 112.4 d (+ ?)
Orbital solution: yes
Ref: Underhill & Hill (1994), De Becker et al. (2019)
Quality flag (Q): I
Comments:
Despite a clear non-thermal radio signature in 1993 data (Montes et al. 2004), a more recent monitoring revealed a steady and thermal radio emission along the 112.4 d orbit (De Becker et al. 2019). The latter study led to the conclusion that the most likely scenario to reconcile these apparently contradicting results is to consider a tripe system, when the third star wind would collide the ones of the 112.4 d period system on a wide orbit, and therefore produce synchrotron radiation detectable at some epochs (depending on the separation and on the amplitude of free-free absorption mainly by the WN stellar wind).