Secular variability of the longitudinal magnetic field of the Ap star gamma Equ

Abstract

We present an analysis of the secular variability of the longitudinal magnetic field B_e in the roAp star gamma Equ (HD 201601). Measurements of the stellar magnetic field B_e were mostly compiled from the literature, and append also our 33 new B_e measurements which were obtained with the 1-m optical telescope of Special Astrophysical Observatory (Russia). All the available data cover the time period of 58 years, and include both phases of the maximum and minimum B_e. We determined that the period of the long-term magnetic B_e variations equals 91.1 +/- 3.6 years, with B_e (max) = + 577 +/- 31 G and B_e (min) = -1101 +/- 31 G.

arXiv comment5 pages, 2 figures, accepted to MNRAS

References in corpus (2)

• Measurements of magnetic fields over the pulsation cycle in six roAp stars with FORS1 at the VLT
• Catalogue of averaged stellar effective magnetic fields. I. Chemically peculiar A and B type stars

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• Measuring stellar magnetic fields with the low resolution spectropolarimeter of the William Herschel Telescope
• HD 18078: A very slowly rotating Ap star with an unusual magnetic field structure
• Search of X-ray emission from roAp stars: The case of gamma Equulei