The optical and X-ray correlation of the V725 Tau (= A0535+26) variability in 1973-1988

Details The optical and X-ray correlation of the V725 Tau (= A0535+26) variability in 1973-1988 The optical and X-ray correlation of the V725 Tau (= A0535+26) variability in 1973-1988

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pazh...15..421l&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 15, May 1989, p. 421-428. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

5

Optical Properties, Pulsars, Stellar Flares, Ubv Spectra, X Ray Sources, B Stars, Light Curve, Stellar Mass Ejection

Scientific paper

The data of the photoelectrical UBV-observations of the X-ray pulsar V725 Tau (= A0535+26) are presented. A high correlation (r = 0.94) of the slow optical variability, pulsar period, and average X-ray flux at the quiescent state have been established as the result of the comparison of all available photometric (since 1973) and X-ray data. It is concluded that the X-ray activity of the object is related with the Be-star's mass loss enhancement, which corresponds to gradual increase of brightness since 1965.

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