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Walraven observations of the April 1987 superoutburst of the eclipsing dwarf nova Z Chamaeleontis

E. Kuulkers, S. van Amerongen, J. van Paradijs, H. J. A. Röttgering

Abstract

We present optical (3200 A-6000 A) photometry of the SU Ursae Majoris type dwarf nova Z Chamaeleontis, made during the superoutburst in April 1987. We find that the rise to maximum of the precursor is wavelength dependent. During the precursor a large pre-eclipse dip develops in the orbital light curve, stretching from orbital phase ∼0.6 to ∼0.9 (eclipse≡phase 0.0). The dip is strongest at the shortest wavelengths. It may be caused by an occultation of the inner parts of the accretion disk.

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Key concepts: Physics, Dwarf nova, Astrophysics, Photometry (optics), Light curve, Eclipse, Occultation, Accretion disc