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Механизмы, меняющие импульсы звезд в звездных системахстатья
- Авторы: Чумак О.В., Чумак З.Н.
- Сборник: Динамика Галактики и внегалактических систем
- Серия: Труды Астрофизического института Академии Наук Казахской ССР
- Том: 28
- Год издания: 1976
- Место издания: "Наука" Казахской ССР Алма-Ата, Казахстан "Наука" Казахской ССР Алма-Ата, Казахстан
- Первая страница: 81
- Последняя страница: 86
- Аннотация: Momentum-changing mechanisms are examined which are associated with the motion of a star through a uniform diffuse medium and with interactions between stars and objects of relatively large mass (e.g., open star clusters). The mechanisms considered include accretion, hydrodynamic resistance, and dynamic friction in a dust cloud. The dynamic effectiveness of these mechanisms is compared. It is concluded that: (1) dynamic friction in a diffuse medium may be the dominant momentum-changing mechanism in stellar systems where there are no massive scattering centers but there is more or less uniformly distributed diffuse matter in which the maximum stellar velocity does not exceed a certain value (designated vb); (2) hydrodynamic resistance can be very effective in the case where typical stellar velocities are comparable to vb; (3) momentum changes associated with accretion are always less than those due to dynamic friction; and (4) massive objects present in galaxies cannot produce an effective change in stellar momentum on time scales of less than 10 billion years.
- Добавил в систему: Чумак Олег Васильевич