PUBLICATIONS OF THE ASTRONOMICAL OBSERVATORY OF BELGRADE 107, Page 91-94, https://doi.org/10.69646/14sbac14p
PPROCEEDINGS OF THE XIV SERBIAN-BULGARIAN ASTRONOMICAL CONFERENCE, Vrnjačka Banja, Serbia, September 23-27, 2024, Eds. Milan S. Dimitrijević, Evgeni Semkov, Zoran Simić, Goran Damljanović, Momchil Dechev
Published by: Astronomical Observatory, Volgina 7, 11060 Belgrade 38, Serbia

We use B-band historical light curve of AF And in the time interval 1918-1990 to search for photometric periods applying Structure eminence function (SEF) method and its derivative the Periodograph function (PGF). Periods of 3.90 ± 0.10 yr and 4.55 ± 0.10 yrare found. SEF is the dependence of the structure amplitude on the structure time lengthand extracts and uses profiles of these structures. The positions of the SEF maxima mark eminent periods and quasi periods.