X-ray and optical periodicities in X-ray binaries$$ I. A0535+26статья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A homogeneous set of UBV photometry (354 data points obtained between 1983 and 1998) for the Be/X-ray binary A0535+26 = V725 Tau is analysed, aiming to look for possible periodic component(s). After subtraction of the long-term variation it was found that only a ~ 103d periodic component remains in the power spectra in both the V and B colour bands. The probability of chance occurrence of such a peak is less than 0.1%. There are no signs of optical variability at the X-ray period (~ 111d). We discuss possible reasons for a 103-day modulation and suggest that it corresponds to a beat frequency of the orbital period of the neutron star and the precession period (~ 1400d) either of an accretion disc around the neutron star or a warped decretion disc around the Be star.