Journal Article

The determination of the rotation period and magnetic field geometry of the strongly magnetic roAp star HD 154708*

S. Hubrig, G. Mathys, D. W. Kurtz, M. Schöller, V. G. Elkin and H. F. Henrichs

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 2, pages 1018-1022
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14768.x
The determination of the rotation period and magnetic field geometry of the strongly magnetic roAp star HD 154708*

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We obtained 13 spectropolarimetric observations of the strongly magnetic rapidly oscillating Ap star HD 154708 over 3 months with the multimode instrument FORS 1, installed at the 8-m Kueyen telescope of the Very Large Telescope. These observations have been used for the determination of the rotation period of P= 5.3666 ± 0.0007 d. Using stellar fundamental parameters and the longitudinal magnetic field phase curve, we briefly discuss the magnetic field geometry. The star is observed nearly pole-on and the magnetic field geometry can be described by a centred dipole with a surface polar magnetic field strength Bd between 26.1 and 28.8 kG and an inclination of the magnetic axis to the rotation axis in the range to .

Keywords: techniques: polarimetric; stars: chemically peculiar; stars: individual: HD 154708; stars: magnetic fields; stars: oscillations

Journal Article.  3885 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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