Reeve, D; Howarth, ID; (2018) Are the O stars in WR plus O binaries exceptionally rapid rotators. Monthly Notices of the Royal Astronomical Society , 478 (3) pp. 3133-3137. 10.1093/mnras/sty1296.

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Abstract

We examine claims of strong gravity-darkening effects in the O-star components of WR+O binaries. We generate synthetic spectra for a wide range of parameters, and show that the line-width results are consistent with extensive measurements of O stars that are either single or are members of ‘normal’ binaries. By contrast, the WR+O results are at the extremes of, or outside, the distributions of both models and other observations. Remeasurement of the WR+O spectra shows that they can be reconciled with other results by judicious choice of pseudo-continuum normalization. With this interpretation, the supersynchronous rotation previously noted for the O-star components in the WR+O binaries with the longest orbital periods appears to be unexceptional. Our investigation is therefore consistent with the aphorism that if the title of a paper ends with a question mark, the answer is probably ‘no’.

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