Multicomponent stellar wind from hot subdwarfs stars

V. Votruba1,3 A. Feldmeier2 J. Krticka1, J. Kubat3,

1Ustav teoreticke fyziky a astrofyziky, Masarykova univerzita, Brno, Czech Republic
2Institut für Physik und Astronomie, Universität Potsdam, Germany
3Astronomicky ustav, Akademie ved Ceske republiky, Ondrejov, Czech Republic

Stellar wind from hot subdwarf stars is mainly accelerated by the interaction of ultraviolet photospheric radiation with metals, mainly oxygen. Absorbing ions share momentum through Coulombic collisions with the remaining passive part of the plasma (namely protons). We found that in the case of the winds from hot subdwarfs, interactions could be so small that they stop the momentum transfer between the passive bulk of plasma and absorbing ions. As a result wind decouples at a certain point.

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