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Astron. Astrophys. 322, 197-201 (1997)


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Constraints on the magnetic configuration of Ap stars from simple features of observed quantities

M. Landolfi 1, S. Bagnulo 2, M. Landi Degl'Innocenti 3, E. Landi Degl'Innocenti 4 and J.L. Leroy 5

1 Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy (landolfi@arcetri.astro.it)
2 Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland (sba@star.arm.ac.uk)
3 C.N.R., Gruppo Nazionale di Astronomia, Unità di Ricerca di Arcetri, Largo E. Fermi 5, I-50125 Firenze, Italy (mlandi@arcetri.astro.it)
4 Dipartimento di Astronomia e Scienza dello Spazio, Università degli Studi di Firenze, Largo E. Fermi 5, I-50125 Firenze, Italy (landie@arcetri.astro.it)
5 Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, F-31400 Toulouse, France (leroy@srvdec.obs-mip.fr)

Received 28 October 1996 / Accepted 3 December 1996

Abstract

According to the oblique rotator model, the time variations of the quantities usually employed to investigate the magnetic configuration of Ap stars (mean longitudinal field, mean surface field, broad band linear polarization) are described by simple laws. For each quantity, certain typical features can easily be identified. We show that these features set definite constraints on the magnetic configuration.

Key words: polarization – stars: magnetic fields – stars: chemically peculiar

Send offprint requests to: M. Landolfi

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998

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