The determination of the rotation period and magnetic field geometry of the strongly magnetic roAp star HD154708⋆
نویسندگان
چکیده
We obtained thirteen spectropolarimetric observations of the strongly magnetic rapidly oscillating Ap star HD154708 over three months with the multi-mode instrument FORS1, installed at the 8-m Kueyen telescope of the VLT. These observations have been used for the determination of the rotation period of P = 5.3666± 0.0007d. 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 22.5◦ to 35.5◦.
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