Abstract
Abstract The TESS lightcurves of the two cool Ap stars, 78 Vir and 52 Her, are used to derive new rotational periods for both stars. A frequency analysis of the light curve of 52 Her with the Generalized Lomb–Scargle periodogram reveals a periodic structure with three harmonics. The inverse of the fundamental frequency yields a rotational period of 3.840 ± 0.037 days for 52 Her. The same analysis for 78 Vir yields two harmonics with a rotation period of 3.718 ± 0.037 days, only slightly shorter than previous determinations.
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