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Intrinsic polarization of Wolf-Rayet stars due to the rotational modulation of the stellar wind

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ABDELLAOUI Slah KRTIČKA Jiří KURFÜRST Petr

Rok publikování 2024
Druh Článek ve sborníku
Konference Massive Stars Near and Far Proceedings IAU Symposium No. 361, 2024
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1017/S1743921322002241
Klíčová slova stars: rotation; stars: Wolf-Rayet; stars: mass loss; techniques: polarimetric
Popis Wolf-Rayet stars are regarded as candidates for progenitors of core-collapse supernovae, and they are expected to be progenitors of long gamma-ray bursts. These types of stars are considered to be fast rotators. Their high rotation speed breaks the sphericity of the star and leads to an axisymmetric wind density structure. In such a case, the electron scattering takes place in a nonspherical environment, and as a result, we might expect an intrinsic polarization. We present a 2.5D radiation hydrodynamic stellar wind model of these stars. The model simulations account for the deformation of the stellar surface due to rotation, gravity darkening, and nonradial forces. We computed the polarization from the density variable of the hydrodynamic model, derived the upper limit of rotational velocities, and found no conflict with the previous studies of Wolf-Rayet stars.

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