Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...100..277m&link_type=abstract
Astronomy and Astrophysics, vol. 100, no. 2, July 1981, p. 277-283.
Astronomy and Astrophysics
Astrophysics
31
Light Curve, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, X Ray Sources, Astronomical Photometry, Brightness, Power Spectra, Stellar Luminosity
Scientific paper
UBV and fast photometry of the X-ray source 2A 0526-328 optical counterpart confirms a cataclysmic-variable nature. The light curve shows a periodic hump approximately 0.27-mag full amplitude in B and V at P = 5.18 h, average brightness variations of 0.33 mag on a time scale of 2 d and approximately 0.1-mag flickering on a time scale of some minutes. The hump is thought to derive from a bright spot on an accretion disk; fast color behavior gives evidence for both disk and hot-spot emissivity. A pronounced hump phase shift depending on the system's average luminosity is explained by the hot spot motion on a disk changing size with accretion rate.
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