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Optical eclipses and precession effects in the X-ray binary system HD 77581=4U 0900-40статья
- Авторы: Khruzina T.S., Cherepashchuk A.M.
- Журнал: SOVIET ASTRONOMY
- Том: 26
- Номер: 6
- Год издания: 1982
- Первая страница: 310
- Последняя страница: 316
- Аннотация: The long-period (P=93.3 days) variability of the amplitude and shape of the optical light curves of the X-ray binary HD 77581 has been discovered from the analysis of all published photometric data. The 93.3-day period is presumably the period of the forced precession of the rotational axis of the optical star. It is shown that the system HD 77581 appears to be an eclipsing binary in the optical range with the amplitude of the ellipticity effect ~0,04 mag and the depth of the eclipse reaching ~0,04 mag. The eclipses are caused by the gaseous streams and the accreting structure, the orientation of which in the binary system is varying with the precession period of the optical star. The estimates of the parameters of the system are obtained. It is shown that the parameter of the Roche Lobe filling for the optical star B \mu < 1. The mass of the neutron star is Мx= (1,6±0,3) М(sun). The forced precession of the optical star is connected with the non-perpendicularity of its rotational axis to the orbit plane of the binary system. This non-perpendicularity may be a result of supernova explosion in a close binary system.
- Добавил в систему: Хрузина Татьяна Сергеевна