EDP Sciences
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Volume 415, Number 2, February IV 2004
Page(s) 661 - 669
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20031380

A&A 415, 661-669 (2004)
DOI: 10.1051/0004-6361:20031380

Measurements of magnetic fields over the pulsation cycle in six roAp stars with FORS 1 at the VLT

S. Hubrig1, D. W. Kurtz2, S. Bagnulo1, T. Szeifert1, M. Schöller1, G. Mathys1 and W. A. Dziembowski3

1  European Southern Observatory, Casilla 19001, Santiago 19, Chile
2  Centre for Astrophysics, University of Central Lancashire, Preston, PR1 2HE, UK
3  Warsaw University Observatory, Al. Ujazdowskie, 4, 00-478 Warsawa, Poland

(Received 12 June 2003 / Accepted 29 August 2003)

With FORS 1 at the VLT we have tried for the first time to measure the magnetic field variation over the pulsation cycle in six roAp stars to begin the study of how the magnetic field and pulsation interact. For the star HD 101065, which has one of the highest photometric pulsation amplitudes of any roAp star, we found a signal at the known photometric pulsation frequency at the 3 $\sigma$ level in one data set; however this could not be confirmed by later observations. A preliminary simple calculation of the expected magnetic variations over the pulsation cycle suggests that they are of the same order as our current noise levels, leading us to expect that further observations with increased S/N have a good chance of achieving an unequivocal detection.

Key words: stars: magnetic fields -- stars: oscillations -- stars: chemically peculiar

Offprint request: S. Hubrig, shubrig@eso.org

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