Jarzebowski (1960) performed the first photoelectric observations
of the B9p star HD 32633 in blue light and found what he
thought was irregular variability. Rakosch (1962) made uv, blue,
and yellow observations of this star using HD 32428 and HD
32733 as the primary and secondary comparison stars,
respectively. He found a single wave asymmetric variability in
6.429 
0.005 days. This period has been confirmed and
refined by other studies, e.g. Renson (1984).
Ninety-one uvby FCAPT observations were obtained of
HD 32633 during years 2, 4, 5, and 6. A periodogram analysis of
the u data yielded a period of 6.4309 days. I compared my u
photometry to Rakosch's uv photometry. His phase of
maximum light was satisfactory, but I had to slightly decrease
my period to get good agreement:
Figure 1 (click here) shows the FCAPT uvby photometry (pluses) and the uv photometry of Rakosch converted to u (solid diamonds). HD 32633 shows an asymmetric in-phase variability. The amplitudes are 0.055 mag for u, 0.04 mag for v, 0.045 mag for b, and 0.035 mag for y.