Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........83m&link_type=abstract
Thesis (PH.D.)--THE OHIO STATE UNIVERSITY, 1990.Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3
Computer Science
Scientific paper
Time resolved spectroscopic observations of dwarf novae during seven outbursts are presented. In each case the observations began at least one night before the system went into outburst and continued through the first night of the outburst or longer. Two of these outbursts occurred in RX And, one in SS Cyg, one in KT Per, one in AH Her, one in AR And, and one in TW Vir. In each case where the system was observed for at least two days before the outburst, changes were observed to take place in the continuum prior to the outburst. These changes were usually in the form of a rise in the continuum level. The emission lines were observed to vary in strength and/or width before the outburst in almost every case. Because of these two observations, it was determined that these dwarf novae were in a state which was neither quiescence nor outburst from up to five days prior to outburst until the outburst actually began. This state is called the preoutburst stage. A simple disk model was created in which the inner and outer radii of the line -emitting region could be adjusted. The observed changes in the dwarf novae emission line profiles were reproduced using this model. The results are consistent with a heating front moving through the disk. The actual transition between preoutburst and outburst was observed in TW Vir for the first time in any dwarf nova. These data were compared to Mineshige's model in which the main outburst is preceded by a warm phase. A simple model was constructed which mimics the time-dependent behavior of the more elaborate Mineshige model. The agreement with the observations is quite good.
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