Open AccessNew Determinations of the Rotational Periods of 78 Vir (A2p SrCrEu) and 52 Her (A1p SiSrCr)
Author(s) -
Richard Monier,
David Mary
Publication year - 2022
Publication title -
research notes of the aas
Language(s) - English
Resource type - Journals
ISSN - 2515-5172
DOI - 10.3847/2515-5172/ac5891
Subject(s) - harmonics , rotation period , stars , rotation (mathematics) , light curve , physics , astrophysics , inverse , periodogram , spherical harmonics , mathematics , statistics , geometry , quantum mechanics , voltage
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.