Nova V4743 Sagittarii 2002: An Intermediate Polar Candidate

We present the results of 11 nights of CCD unfiltered photometry of V4743 Sgr(Nova Sgr 2002 # 3) from 2003 and 2005. We find two periods of 0.2799 d ~ 6.7 hand 0.01642 d ~ 24 min in the 2005 data. The long period is also present in the2003 data, but only weak evidence of the shorter period is found in this year.The 24-min period is somewhat longer than the 22-min period, which was detectedfrom X-ray observations. We suggest that the 6.7-h periodicity represents theorbital period of the underlying binary system and that the 24-min period isthe beat periodicity between the orbital period and the X-ray period, which ispresumably the spin period of the white dwarf. Thus, V4743 Sgr should beclassified as an intermediate polar (DQ Her star). About six months after thenova outburst, the optical light curve of V4743 Sgr seemed to showquasi-periodic oscillations, which are typical of the transient phase inclassical nova. Therefore, our results support the previous suggestion that thetrans ition phase in novae may be related to intermediate polars.Comment: 7 pages, 6 figures, AJ accepte