izvcrao Изв. Крымск. Астрофиз. Обсерв. Izv. Krymsk. Astrofiz. Observ. Известия Крымской астрофизической обсерватории Izvestiya Krymskoi Astrofizicheskoi Observatorii 0367-8466 3034-4107 Киселев Н.Н., пос. Московский, Москва, РФ RU 698 Материалы конференции Сonference proceedings Nature of light variations of the He-strong CP star HD 37776 Nature of light variations of the He-strong CP star HD 37776 Mikulasek Z. Krticka J. Zverko J. Ziznovský J. Institute of Theoretical Physics and Astrophysics, Masaryk University, CZ-611 37, Brno, Czech Republic; Observatory and Planetarium of J. Palisa, VSB – Technical University, Ostrava, Czech Republic Institute of Theoretical Physics and Astrophysics, Masaryk University, CZ-611 37, Brno, Czech Republic Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, Slovak Republic Astronomical Institute, Slovak Academy of Sciences, Tatranska Lomnica, Slovak Republic 01 05 2008 104 2 221 221 15 05 2020 Copyright (c) 2008 , , , Copyright (c) 2008 Mikulasek Z., Krticka J., Zverko J., Ziznovský J. 2008 , , , Mikulasek Z., Krticka J., Zverko J., Ziznovský J. Метаданные этой статьи доступны по лицензии Creative Commons «Attribution» («Атрибуция») 4.0 Всемирная. Авторское право и право на публикацию текстов, представленных в журнале  "Известия Крымской астрофизической обсерватории", сохраняются за авторами, при этом право первой публикации предоставляется журналу. Тексты могут свободно использоваться при условии правильного цитирования с указанием авторства в соответствии с лицензией Creative Commons «Attribution» («Атрибуция») 4.0 Всемирная. The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Izvestiya Krymskoi Astrofizicheskoi Observatorii is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

We simulate light curves of the helium strong chemically peculiar star HD 37776 = V901 Ori assuming that the observed periodic light variations originate as a result of inhomogeneous horizontal distribution of chemical elements on the surface of a rotating star. We show that the chemical peculiarity influences the monochromatic radiative flux, mainly due to bound-free processes. Using the model of the distribution of silicon and helium on HD 37776 surface, derived from the spectroscopy, we calculate a photometric map of the surface and consequently the uvby light curves of this star. Basically, the predicted light curves agree in shape and amplitude with the observed ones. We conclude that the basic properties of variability of this helium strong chemically peculiar star can be understood in terms of the model of spots with peculiar chemical composition.