THE NUMERICAL THREE-DIMENSIONAL HYDRODYNAMIC SIMULATION OF THE -RAY BURSTERS AND X-RAY BURSTERS
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Файли
Дата
2013
Науковий керівник
Укладач
Редактор
Назва журналу
Номер ISSN
Номер E-ISSN
Назва тому
Видавець
Astroprint
Анотація
An radiative wind accretion onto the compact object in a detached close binary system (CBS) where one of the components is a supergiant with radiation stellar wind that blows from its surface, and another component is a compact object (black hole or neutron star), is simulated applying methods of three-dimensional numerical hydrodynamics. The simulation of bursts similar to the gamma-ray bursters and X-ray bursters, i.e. isolated bursts with nearly zero in time ascending and descending branches with amplitudes from 6 - 7m to 15 - 18m, commences in the vicinity of the compact object when the precession of the donor star starts. Due to the course numerical spatial grid of 0.01 units of the orbital separation, the duration of such isolated bursts is 10-40 minutes of the orbital time. The burst simulation is as follows: when the donor stars precession starts, small grid-cell-sized regions of higher density appear in the vicinity of the
compact object due to the RayleighTaylor instability. The temperature in one of those regions increases abruptly when they interact with the stellar wind from the donor star. Prior to the temperature increase, the indicated regions were radiopaque. When the
temperature reaches its peak, those regions become radiolucent, and all energy contained there is momentarily illuminated, giving off a burst that appears as an isolated sharp peak. That is how the bursts similar
to the gamma-ray bursts and X-ray bursts are simulated.
Опис
Odessa Astronomical publications / Одесская астроном. обсерватория . – Одесса : Астропринт, 2013 . – Vol.26/1.
Ключові слова
close binary system, X-ray bursters, gamma-ray bursters
Бібліографічний опис
Odessa Astronomical Publications