Variability of Balmer Profiles in Magnetic Ap/Bp Stars

Autor(en)

Gennady G. Valyavin, Byeong-Cheol Lee, Denis Victorovich Shulyak, Inwoo Han, Oleg Kochukhov, D. Khang, Kang-Min Kim

Abstrakt

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(en)

Institut für Astrophysik

Externe Organisation(en)

Korea Astronomy and Space Science Institute, Uppsala University

Seiten

245

Publikationsdatum

2007

ÖFOS 2012

103003 Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e52d4ded-34df-4f36-a458-4139d2b11e02