Magnetic stars from a FEROS cool Ap star survey

Details Magnetic stars from a FEROS cool Ap star survey Magnetic stars from a FEROS cool Ap star survey

2011-11-28

arxiv.org/abs/1111.6448v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 21 figures, accepted for publication in MNRAS

Scientific paper

New magnetic Ap stars with split Zeeman components are presented. These stars were discovered from observations with the FEROS spectrograph at the ESO 2.2-m telescope. Fifteen new magnetic stars are analysed here. Several stars with very strong magnetic fields were found, including HD\,70702 with a 15-kG, and HD\,168767 with a 16.5-kG magnetic field strength measured using split Zeeman components of spectral lines and by comparison with synthetic calculations. The physical parameters of the stars were estimated from photometric and spectroscopic data. Together with previously published results for stars with strong magnetic fields, the relationship between magnetic field strength and rotation period is discussed.

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