High-speed photometry of Z Chamaeleontis covering the 1983 March normal outburst

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Abstract
High-speed photometry over a three-week period covering the 1983 March 13 normal outburst of Z Cha is presented. Multicolour observations revealed significant reddening during eclipse in both the quiescent and outburst states. Quiescent primary eclipse timings remained consistent with an increasing orbital period. Hotspot eclipse timings revealed that the accretion disc had physically expanded in radius after the outburst. The duration of the eclipse during outburst however, limited the optical emission to a region bounded by the radius of the pre-outburst accretion disc. In the final stages of decline this emission region had shrunk in size by a factor of ~4. The post-outburst observations showed the hotspot eclipse to be less stable in structure compared to before the outburst.

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