Abstract
We study the P Cygni profiles in three dwarf novae. In a study of Z Cam by Szkody and Mateo (1986), it was claimed that the mass loss continues for 1 month after the start of a standstill and ceases within 6 months. This results of the work depends on only one standstill spectrum. On the other hand, in another work carried out by Ozkan and Esenoglu (1994) it was found that the case may not be true for Z Cam, because two ultraviolet spectra obtained during the sixth month of another standstill configuration shows the P Cygni profile having a stronger absorption component and a weaker emission component which implies that the mass loss may continue during the standstill. Following these works in the present study, we aimed to investigate this situation for Z Cam and two other Z Cam type dwarf novae, RX And and HL CMa. considering all ultraviolet spectra obtained with IUE and AAVSO observations (Mattei, 1994).
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