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Молодая звезда RY Tau в режиме магнитного пропеллера
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Проведен анализ спектрального и фотометрического мониторинга классической звезды типа T Tельца RY Tau в пе- риод с 2013 по 2024 гг. Сделан вывод о том, что профили спектральных линий Hα и D NaI формируются в пото- ках магнитосферной аккреции и конического ветра, стартующего с границы магнитосферы. Показано, что потоки аккреции и ветра изменяются на шкале времени около 20 суток. В изменениях аккреции и ветра найдена причинно- следственная связь: сначала усиливается аккреция, а через два дня уменьшается поглощение в ветре на луче зрения. Временной лаг определяется наклоном магнитного диполя и углом раскрытия конического ветра. Предполагается, что RY Tau находится в режиме неустойчивого пропеллера.
The spectral and photometric monitoring of the classical T Tauri star RY Tau in the period from 2013 to 2024 was analyzed. It was concluded that the profiles of the Hα and D NaI spectral lines are formed in the flows of magnetospheric accretion and conical wind starting from the boundary of the magnetosphere. It was shown that the predominant flow direction (accretion or wind) changes on a time scale of about 20 days. A cause-and-effect relationship was found in the alternation of accretion and wind: first, accretion increases, and two days later, absorption in the wind along the line of sight decreases. The time lag is determined by the inclination of the magnetic dipole and the opening angle of the conical wind. It is assumed that RY Tau is in unstable propeller mode, and fluctuations in the accretion and wind flows are caused by density waves in the accretion disk.
Institute of Astronomy of the Russian Academy of Sciences
Title: Молодая звезда RY Tau в режиме магнитного пропеллера
Description:
Проведен анализ спектрального и фотометрического мониторинга классической звезды типа T Tельца RY Tau в пе- риод с 2013 по 2024 гг.
Сделан вывод о том, что профили спектральных линий Hα и D NaI формируются в пото- ках магнитосферной аккреции и конического ветра, стартующего с границы магнитосферы.
Показано, что потоки аккреции и ветра изменяются на шкале времени около 20 суток.
В изменениях аккреции и ветра найдена причинно- следственная связь: сначала усиливается аккреция, а через два дня уменьшается поглощение в ветре на луче зрения.
Временной лаг определяется наклоном магнитного диполя и углом раскрытия конического ветра.
Предполагается, что RY Tau находится в режиме неустойчивого пропеллера.
The spectral and photometric monitoring of the classical T Tauri star RY Tau in the period from 2013 to 2024 was analyzed.
It was concluded that the profiles of the Hα and D NaI spectral lines are formed in the flows of magnetospheric accretion and conical wind starting from the boundary of the magnetosphere.
It was shown that the predominant flow direction (accretion or wind) changes on a time scale of about 20 days.
A cause-and-effect relationship was found in the alternation of accretion and wind: first, accretion increases, and two days later, absorption in the wind along the line of sight decreases.
The time lag is determined by the inclination of the magnetic dipole and the opening angle of the conical wind.
It is assumed that RY Tau is in unstable propeller mode, and fluctuations in the accretion and wind flows are caused by density waves in the accretion disk.
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