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Long-term variability of the Be/X-ray binary A0535+26. I - Optical and UV spectroscopyстатья
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Clark J.S., Tarasov A.E., Steele I.A., Coe M.J., Roche P., Shrader C., Buckley D.A.H, Larionov V., Larionova L., Lyuty V.M., Zaitseva G.V., Grunsfeld J., Fabregat J., Parise R.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 294
- Номер: 1
- Год издания: 1998
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 165
- Последняя страница: 176
- DOI: 10.1046/j.1365-8711.1998.01257.x
- Аннотация: The results of a seven-yr optical and UV spectroscopic study of the high-mass X-ray binary A0535+26 are presented. It was found that throughout the period of the observations the line profile of H-alpha showed considerable variability. A correlation between the equivalent width of H-alpha and both V-band magnitude and (B-V) color excess was observed, albeit with considerable scatter present in the data set. A giant X-ray flare in early 1994 was accompanied by a fading in optical and infrared photometric bands, and a reduction in the equivalent width of H-alpha. When the star was observed in 1994 September, it was found to have developed a double-peaked H-alpha profile, and further observations saw the V/R peak ratio vary cyclically, with a period of about one yr. If this is identified as a global one-armed oscillation, it becomes the shortest period ever observed in a Be star. The accompanying photometric and spectroscopic observations provide a test of any theory seeking to describe the onset and behavior of such a density wave.
- Добавил в систему: Зайцева Галина Владимировна