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We present the analysis of the spectroscopic observations of a newlydiscovered cataclysmic variable HS0551+7241. In 1995 the star's brightnessdropped by Delta(B)~2.5 mag and HS0551+7241 entered a low state lasting for ~2yr. The H-alpha, H-beta and HeII(4686) emission line radial velocity curvesshow evidence of short ~50 min fluctuations superimposed on longer, ~4 hourvariations. We found similar modulations in the line fluxes and the lineequivalent widths. The continuum magnitude light curve suggest that HS0551+7241may be an eclipsing system. If the 4 hour period is related to the orbitalperiod then the mass function is ~0.138 M_sun. Relatively strong HeII(4686)emission and short fluctuation may suggest that the binary is an intermediatepolar. In that case the ~50 min variations would correspond to the Alfvenradius of ~3 x 10^10 cm.Comment: 17 pages (including 4 figures and 3 tables), to appear in  Astronomical Journal, April 1998 issu

HS 0551+7241: A New Possible Magnetic Cataclysmic Variable in the Hamburg-C[CLC]f[/CLC]A Bright Quasar Survey