Three-dimensional numerical hydrodynamical simulation of low/hard and high/soft states in accretion discs of microquasars and quasars on base of undefined precession
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Дата
2015
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Науковий керівник
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Видавець
Одеський національний університет імені І. І. Мечникова
Анотація
In this study, the models of slaved
precession of accretion disc and donors radiationdriven
wind were performed using three-dimensional
numerical astrophysical methods by the example of
microquasar Cyg X-1. As is shown, in the course of
precession of the accretion disc blown by the donor’s
wind the states with high and low temperature (low
and high mass accretion rate, respectively) start being
generated in the centre of disc. Our computations
of disc precession performed on base of undefined
precession that means each point of rotation axis of
accretion disc makes unclosed difficult curve instead
of a circle as it is in case of definite precession. In this
case, the transition between states of high and low
temperature takes place irregularly and not depend on
precession period. The duration of transition between
these both states is less than intervals of states on
several orders of magnitudes.
Опис
Ключові слова
Stars: close binary system, microquasars, quasars
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації