Two W-R binaries are reexamined using coude spectroscopy. The new orbit solution for HD 186943 suggests that the minimum mass of the WN4 star is 9-11 solar masses. The companion appears to be approximately of the type O9 V and is about 1.3 mag brighter than the WN4 star. The minimum mass for the O star indicates that the system should eclipse. Analyzing current data and previous studies, it is shown that HD 211853 is actually a quadruple system that consists of a widely spaced pair of close binaries of types WN6 plus O and O plus O.
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Philip Massey (1981) studied this question.
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