Searching for the white dwarf in dwarf novae. Slow rise symmetrical outbursts in SS Cygni

摘要

The first objective in searching for the white dwarf in dwarf novae was to provide information on the brightness of 11 dwarf nova type cataclysmic variables both prior to and during nine 8-hour shift observing runs with the International Ultraviolet Explorer (IUE). This information was essential to observing the stars at their quiescent state in order to search for their white dwarf components. The second objective of this project was to compile all the optical observations obtained on these targets, digitize and evaluate them, and provide them to the IUE team for correlation with IUE observations. The first objective of the second project was to analyze the optical behavior of the dwarf nova SS Cygni, determine optimum times for the occurrence of its rare symmetrical outbursts (occurring once every two years) for scheduling IUE observations, and provide simultaneous optical monitoring during the IUE observing runs. The second objective was to compile all the optical observations obtained on SS Cygni, evaluate them, and provide them to the IUE team for correlation with the IUE data.