Resolved magnetically split lines as enhanced pulsation diagnostics in roAp stars

G. Mathys; D.W. Kurtz; V.G. Elkin

doi:10.1051/eas:2005105

All issues

Volume 17 (2005)

EAS Publications Series, 17 (2005) 113-118

Abstract

Issue		EAS Publications Series Volume 17, 2005 Element Stratification in Stars: 40 Years of Atomic Diffusion


Page(s)		113 - 118
DOI		https://doi.org/10.1051/eas:2005105
Published online		13 January 2006

Element Stratification in Stars: 40 Years of Atomic Diffusion
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

G. Mathys¹, D.W. Kurtz² and V.G. Elkin²

¹ European Southern Observatory, Casilla 19001, Santiago 19, Chile
² Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK

Abstract

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.