Variability of Balmer Profiles in Magnetic Ap/Bp Stars
- Author(s)
- Gennady G. Valyavin, Byeong-Cheol Lee, Denis Victorovich Shulyak, Inwoo Han, Oleg Kochukhov, D. Khang, Kang-Min Kim
- 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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- Korea Astronomy and Space Science Institute, Uppsala University
- Pages
- 245
- Publication date
- 2007
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e52d4ded-34df-4f36-a458-4139d2b11e02