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Magnetic Models Can Not Explain The Blazhko Effect in RR Lyrae Stars

Published online by Cambridge University Press:  12 April 2016

M. Chadid ,
S.L.S. Shorlin  and
J.D. Landstreet
M. Chadid
Affiliation:
Observatoire de la Côte d’Azur, UMR 6528, BP 4229, 06304 Nice Cedex 04, France
S.L.S. Shorlin
Affiliation:
Department of Physics & Astronomy, the University of Western Ontario, London, Ontario, CanadaN6A 3K7
J.D. Landstreet
Affiliation:
Department of Physics & Astronomy, the University of Western Ontario, London, Ontario, CanadaN6A 3K7

Abstract

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We report a new series of high-precision Stokes V profiles and longitudinal magnetic field measurements of RR Lyrae, obtained with the MuSiCoS spectropolarimeter over a period of four years. These data provide no evidence whatsoever for a strong magnetic field in the photosphere of RRLyrae, which is consistent with Preston’s (1967) results, but inconsistent with apparent magnetic field detections by Babcock (1958) and Romanov et al. (1987, 1994). Following discussion of these disparate results, we conclude that RR Lyrae is a bona fide non-magnetic star, a conclusion which leads to the general falsification of models of the Blazkho effect requiring strong photospheric magnetic fields.

Type
Part 9. Evolutionary and pulsation properties of variable stars
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 535 - 538
Copyright
Copyright © Astronomical Society of the Pacific 2004

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