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Oblique Pulsator Model for the Blazhko Effect of RR Lyrae Stars

Published online by Cambridge University Press:  12 April 2016

Hiromoto Shibahashi  and
Masao Takata
Hiromoto Shibahashi
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo, Japan
Masao Takata
Affiliation:
Department of Astronomy, University of Tokyo, Tokyo, Japan

Abstract

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By assuming that the RR Lyrae stars have fairly strong dipole magnetic fields with the symmetry axis oblique to the rotation axis of the star, we show that the oscillation mode which would be a pure radial oscillation in absence of the magnetic field has a quadrupole component, which is axisymmetric with respect to the magnetic axis. The aspect angle of the quadrupole component changes due to the stellar rotation, and this apparent variation is interpreted as the Blazhko effect in RR Lyrae stars.

Type
Part 1. The Scientific Programme
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 42 - 43
Copyright
Copyright © Astronomical Society of the Pacific 1995

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