Volume 413, Number 3, January III 2004
|Page(s)||1087 - 1093|
|Published online||07 January 2004|
No evidence of a strong magnetic field in the Blazhko star RR Lyrae*
Observatoire de la côte d'Azur, UMR 6528, BP 4229, 06304 Nice Cedex 04, France
2 Department of Physics, Royal Military College of Canada, PO Box 17000, Station “Forces”, Kingston, Ontario, Canada K7K 4B4
3 Department of Physics & Astronomy, the University of Western Ontario, London, Ontario, Canada N6A 3K7
Corresponding author: M. Chadid, email@example.com
Accepted: 9 October 2003
In this paper we report a new series of high-precision (median G) longitudinal magnetic field measurements of RR Lyrae, the brightest Blazhko star, obtained with the MuSiCoS spectropolarimeter over a period of almost 4 years from 1999-2002. These data provide no evidence whatsoever for a strong magnetic field in the photosphere of RR Lyrae, a result consistent with Preston's ([CITE]) results, but inconsistent with apparent magnetic field detections by Babcock ([CITE]) and Romanov et al. ([CITE], [CITE]). 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. Furthermore, due to the 4 year baseline of our observations, we can also dismiss the hypothesis that RR Lyrae undergoes a 4-year “magnetic cycle”. Therefore the origin of the observed 4–year modulation of RR Lyrae remains unexplained, and we stress the need for additional theoretical efforts to come to a better understanding of this phenomenon.
Key words: stars: variables: RR Lyr / stars: oscillations / stars: magnetic fields / stars: individual: RR Lyrae / techniques: spectroscopic, polarimetric
© ESO, 2004
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