33 Geminorum (HR 2519 = HD 49606) is one of the hottest known Mercury-Manganese stars (Adelman et al. 1996). Bohlender et al. (1993) report that magnetic field measurements yield an average of 440 360 gauss, but do not constitute a definite detection. Glagolevskii et al. (1985) claim a period of 3.3546 day based on light, magnetic field, and spectrum variations. Hipparcos photometry (Adelman et al. 1998) indicates that 33 Gem is not a photometric variable.
Fifty-two and 46 sets of uvby observations were obtained with HD 48097 as the comparison star and HD 47863 as the check star and during the 1996-97 and 1997-98 seasons, respectively (Table 5). During 1997-98, 42 sets were also obtained with HD 47863 as the comparison star and HD 49059 as the check star. The stability of 33 Gem is about the same with both data sets although standard errors of Hipparcos data suggests the later data should be slightly more stable. The slight differences in mean v-c values between seasons might be due to the comparison star HD 48097 being marginally variable. The Scargle periodogram applied to the FCAPT data does not indicate any significant periods. Hence 33 Gem does not appear to be variable.
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