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Дата изменения: Unknown Дата индексирования: Tue Oct 2 04:37:46 2012 Кодировка: Поисковые слова: http news.cosmoport.com 2001 09 19 2.htm |
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Origin of the internal structures in HL Tauri jet (HH 151) |
Russian version |
The HH flow associated with young stellar object HL Tau has an exciting
history and even until now the origin of some its features is not clear yet.
Flow starts as the relatively faint and narrow jet from HL Tau
but at distance of about 20" from the star it abruptly changes direction
by about 14 deg and becomes much brighter and appears complex knotty
morphology. Knotty structures of Herbig-Haro jets are common phenomena
and knowing the origin of such structures is essential for understanding
the processes of jet formation. Basically, there are two theoretical
approaches: different types of instabilities in stationary flow, and
episodic ejection of the matter.
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Fig.1,2. Blink of two epoch observations of HL Tau jet in high (-150 km/s) and low radial velocity (-50 km/s) channels obtained with scanning Fabry-Perot at the 6-m telescope. Values of the proper motions are the same in high and low radial velocity structures. |