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Paper: Physical Properties of the Massive Magnetic Binary θ1 Ori C Components
Volume: 494, Physics and Evolution of Magnetic and Related Stars
Page: 57
Authors: Balega, Yu. Yu.; Chentsov, E. L.; Rzaev, A. Kh.; Weigelt, G.
Abstract: Thirty spectroscopic measurements of radial velocities and twenty eight interferometric observations of relative positions of the young massive magnetic binary θ1 Ori C (HR 1895) components were used to derive a combined 3D orbit. The total mass of the system is 45.5± 10.0M. The masses of the components are M1 =33.5± 3.2M and M2 =12.0± 3.0M for a mass ratio q = 0.36±0.05. However, the accuracy of the combined orbital parameters is rather low. The principal difficulty consists in stochastic variations of absorption lines of the magnetic primary star, caused by a clumpy structure of absorbing material in the plane of the magnetic equator. In addition, weak and shallow lines of the fast rotating secondary do not allow precise radial velocity estimation. We believe that the continuation of θ1 Ori Cspectroscopic monitoring will allow us to refine the orbital parameters over the next few years.
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