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Issue A&A
Volume 392, Number 1, September II 2002
Page(s) L17 - L20
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20021084



A&A 392, L17-L20 (2002)
DOI: 10.1051/0004-6361:20021084

Letter

No magnetic field variations with pulsation phase in the classical Cepheid star $\eta$ Aquilae

G. A. Wade1, M. Chadid2, 3, S. L. S. Shorlin4, S. Bagnulo3 and W. W. Weiss5

1  Department of Physics, Royal Military College of Canada, PO Box 17000, Station "Forces", Kingston, Ontario, Canada K7K 4B4
2  Observatoire de la Côte d'Azur, UMR 6528, BP 4229, 06304 Nice Cedex 04, France
3  European Southern Observatory, Alonso de Cordova 3107 Vitacura, Santiago, Chile
4  Department of Physics & Astronomy, The University of Western Ontario, London, Ontario, Canada N6A 3K7
5  Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria

(Received 23 May (2002) / Accepted 24 July 200 2)

Abstract
We report new high resolution Stokes V spectropolarimetry and ultra-high precision longitudinal magnetic field measurements of the pulsating classical Cepheid $\eta$ Aql which fail to corroborate the report by Plachinda (2000) of a ~100 G magnetic field in this star.


Key words: stars: atmospheres -- stars: variable: $\delta$ Cep -- stars: individual: $\eta$ Aql -- stars: magnetic fields -- polarisation

Offprint request: G. A. Wade, Gregg.Wade@rmc.ca

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© ESO 2002


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