Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-21
Astron.Astrophys.415:661-669,2004
Astronomy and Astrophysics
Astrophysics
9 pages, 5 figures, accepted for publication in A&A
Scientific paper
10.1051/0004-6361:20031380
With FORS1 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 HD101065, 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.
Bagnulo Stefano
Dziembowski Wojciech A.
Hubrig Svetlana
Kurtz Don W.
Mathys Gautier
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