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Observations o fthe Dwarf Nova HL Canis Majoris

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Christopher W. Mauche

Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138

Abstract

Assisted by AAVSO data, IUE ultraviolet spectra, and x-ray observations from the Einstein Observatory 9HEAC-2), we have undertaken an observational and theoretical study of the P Cygni profiles of the dwarf nova HL CMa. The detailsof this study will be published elsewhere (Mauche and Raymond 1986). Discovered in 1980 as a variable a dwarf nova whose light curve oscillates by ³ 3.5 magnitudes between -11 magntidue and ³ 4.5 magnitude with an average recurrence time of only approximately 17 days. Although classified as a U Gem, HL CMa's magnitude at 250 pc], and (infrequent) short standstills suggest that it is an incipient Z Cam. As such, it warrants continued careful monitoring.