Optical Variations of XTE J1859+226 during the 1999 Outburst

Uemura, M.; Kato, T.; Pavlenko, E.; Shugarov, S.; Mitskevich, M.; Fried, R.E.; Sano, Y.

Авторы: Uemura M., Kato T., Pavlenko E., Shugarov S., Mitskevich M., Fried R.E., Sano Y.
Журнал: Publications of the Astronomical Society of Japan
Том: 56
Номер: SP1
Год издания: 2004
Издательство: Astronomical Society of Japan
Местоположение издательства: Japan
Первая страница: S147
Последняя страница: S154
Аннотация: We report on our optical photometric observations of a black hole X-ray transient, XTE J1859 + 226 (= V406 Vul). We detected an optical reflare associated with an X-ray reflare about 50d after the outburst maximum. The X-ray delay of the reflare was shorter than 2.3d. We detected coherent modulations having a period of 0.38385 ± 0.00073 d. The modulation appeared within 7d after the outburst maximum. We propose two obvious interpretations for the nature of the modulations, that is, superhumps or orbital-period variations caused by an irradiated secondary star or an outer disk. The asymmetric profile of the modulations suggests the superhump scenario. The early appearance of superhumps indicates that the tidal dissipation had already grown before the reflare. The growing tidal dissipation is hence less likely to induce the reflare. In conjunction with the short X-ray delay of the reflare, the reflare may be triggered by the X-ray irradiation onto an outer cold disk. The appearance of humps may be earlier than the eccentricity growth time expected from the tidal instability model. It may imply a mass ratio larger than what could be inferred from the reported orbital period.
Добавил в систему: Шугаров Сергей Юрьевич

	ИСТИНА	Войти в систему Регистрация
	ИПМех РАН
	Главная Поиск Статистика О проекте Помощь

ИСТИНА

ИПМех РАН

Optical Variations of XTE J1859+226 during the 1999 Outburstстатья

Прикрепленные файлы