Interaction of the supersonic stellar wind with the incoming flow of the interstellar medium: the influence of the azimuthal magnetic field of the star

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Abstract

The problem of the interaction of a hypersonic stellar wind with the surrounding interstellar medium is considered. The media are regarded as fully ionized and are accounted for within the framework of ideal magnetohydrodynamics. The scientific novelty consists in taking into account the magnetic field of a star. The magnetic field qualitatively changes the shape of the astropause under certain parameters. Astropause is a tangential gap that separates the stellar wind from the interstellar medium. Instead of the classical paraboloidal shape, astropause acquires a tube (or cylindrical) shape. It was demonstrated that the tube shape takes place for slowly moving stars or, in the star's coordinate system, for incoming streams with the Mach number ($M_\infty$) less than the critical one. When a critical Mach number ($M_\infty^*$) is reached, the flow regime bifurcates, and the astropause shape changes from tube to classical. For stars with a strong magnetic field, bifurcation occurs at higher Mach numbers than for stars with a weak magnetic field. It is also shown that one more qualitative restructuring of the flow occurs at $M_\infty = 1$. In this case, the shape of the astropause does not change, but a bow shock and a Mach disk are formed.

About the authors

S. D. KOROLKOV

Space Research Institute

Email: korolkov.msu@mail.ru
Moscow, Russia

V. V. IZMODENOV

Space Research Institute

Author for correspondence.
Email: izmod@iki.rssi.ru
Moscow, Russia

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Copyright (c) 2023 С.Д. Корольков, В.В. Измоденов

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