Spectroscopic searches for evolutionary orbital period changes in WR+OB binaries: the case of WR 141

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Abstract

The results of new low-resolution spectroscopic observations of the short-period system WR 141 (WN5o+O5V–III, P ≈ 21.7d) are presented, as well as the results of their comparison with the material of previous studies in order to search for an evolutionary change in the orbital period. A secular increase in the orbital period of WR 141 with a rate of Р˙=1.6±0.9 sec/year, corresponding to a mass loss rate of M˙WR=(3.1±1.9)×10-5М/yr with the masses of the stars in the system of MWR=39±10Mʘ and MO=37±10Mʘ, is reported. A correlation between the mass loss rate of WR stars and their mass is discussed.

About the authors

I. A. Shaposhnikov

Lomonosov Moscow State University, Sternberg Astronomical Institute; Lomonosov Moscow State University

Author for correspondence.
Email: iv.shaposhnikov@gmail.com

Faculty of Physics

Russian Federation, Moscow; Moscow

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