Further Photometric Observations of the X-ray Binary A0535+26/V725 Tau: A New Activity Cycle

Details Further Photometric Observations of the X-ray Binary A0535+26/V725 Tau: A New Activity Cycle Further Photometric Observations of the X-ray Binary A0535+26/V725 Tau: A New Activity Cycle

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005astl...31..103z&link_type=abstract

Astronomy Letters, vol. 31, Issue 2, p.103-108

Astronomy and Astrophysics

Astronomy

2

Stars&#8212, X-Ray Binaries - Photometry - Variability - A0535+26

Scientific paper

We performed new photoelectric U BV observations of the X-ray binary A0535+26 at the Crimean Station of the Sternberg Astronomical Institute in 1998 2003. After the brightness stabilized at a minimum of about 500 days in duration, a new brightness rise steeper than that observed previously began: the brightness increased over two seasons of observations by a total amplitude of . The physical parameters (T e , n e ) of the additional emission that caused this brightening match, within the error limits, were obtained from the averaged over 15 years, data, that include both the ascending and descending branches of the light curve. We found a delay of the variations in the Hα line relative to the continuum, which is no more than one year.

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