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Magnetic fields of rapidly oscillating Ap stars

Published online by Cambridge University Press:  15 February 2018

G. Mathys
G. Mathys*
Affiliation:
European Southern Observatory, Chile

Extract

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Magnetic field appears to play a major role in the pulsations of rapidly oscillating Ap (roAp) stars. Understanding of the behaviour of these objects thus requires knowledge of their magnetic field. Such knowledge is in particular essential to interpret the modulation of the amplitude of the photometric variations (with a frequency very close to the rotation frequency of the star) and to understand the driving mechanism of the pulsation. Therefore, a systematic programme of study of the magnetic field of roAp stars has been started, of which preliminary (and still very partial) results are presented here.

Magnetic fields of Ap stars can be diagnosed from the Zeeman effect that they induced in spectral lines either from the observation of line-splitting in high-resolution unpolarized spectra (which only occurs in favourable circumstances) or from the observation of circular polarization of the lines in medium- to high-resolution spectra.

Type
Stellar Seismology
Information
International Astronomical Union Colloquium , Volume 139: New Perspectives on Stellar Pulsation and Pulsating Variable Stars , 1993 , pp. 132
Copyright
Copyright © Cambridge University Press 1993

References

Kurtz, D., 1992, Monthly Not. r. Astron. Soc, in press.Google Scholar
Mathys, G., 1991, Astron. Astrophys. Suppl., 89, 121.Google Scholar
Mathys, G., Landstreet, J.D., Lanz, T., 1992, IAU Coll. 138, in press.Google Scholar