The authors present spectrographic data for NS 105-67, which show it to be a double-lined O4f + O6 V spectroscopic binary with a period of 3.301 days. The stellar masses of the components are most probably of the order of 40 M_sun; and 60 M_sun;, thus making this one of the most massive systems known, and the first double-lined O-type system found in the LMC.
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Niemelä et al. (1986) studied this question.