G. Alecian, O. Richard and S. Vauclair (eds)
EAS Publications Series, 17 (2005) 113-118
Resolved magnetically split lines as enhanced pulsation diagnostics in roAp stars
European Southern Observatory, Casilla 19001, Santiago 19,
2 Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK
We show that in rapidly oscillating Ap stars with resolved magnetically split lines, different pulsation behaviours can be expected for the π and σ line components. We outline the prospects that this opens for diagnosis of the pulsation of these stars. We present a first application to the strongly magnetic star HD 166473. While the predicted effect could not be observed (possibly due to the low pulsation amplitude), marginal detection of variation of the mean magnetic field modulus with the pulsation frequency is achieved.
© EAS, EDP Sciences, 2005