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Paper: Variability of Balmer Profiles in Magnetic Ap/Bp Stars
Volume: 362, The Seventh Pacific Rim Conference on Stellar Astrophysics
Page: 245
Authors: Valyavin, G.; Lee, B.-C.; Shulyak, D.; Han, I.; Kochukhov, O.; Khang, D.-I.; Kim, K.-M.
Abstract: A set of high precision measurements of weak variations of hydrogen lines in spectra of seven magnetic Ap/Bp stars was carried out using the BOES echelle spectrograph of the Bohuynsan Optical Astronomy Observatory (South Korea). A weak (1–2 %) periodic variability of the Balmer line wings has been detected in the spectra of 2 program stars. Upper limits of possible variations are presented for the remaining 5 objects. We discuss the discovered variability in the framework of model atmospheres with magnetic force terms included. The periodic changes in the Balmer profiles are caused by perturbations in atmospheres of Ap/Bp stars due to their rotationally modulated non-force-free magnetic fields.
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