A survey of Ap stars for weak longitudinal magnetic fields

Details A survey of Ap stars for weak longitudinal magnetic fields A survey of Ap stars for weak longitudinal magnetic fields

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mast.conf..114a&link_type=abstract

Magnetic stars, Proceedings of the International Conference, held in the Special Astrophysical Observatory of the Russian AS, Au

Astronomy and Astrophysics

Astrophysics

Chemically Peculiar, Magnetic Fields

Scientific paper

We are conducting a magnetic survey of a sample of about 30 spectroscopically-identified Ap stars (selected from the HD catalogue), but with faint or previously undetected magnetic fields. We use the MuSiCoS spectropolarimeter at Telescope Bernard Lyot (Pic du Midi Observatory, France) and the cross-correlation technique Least Squares Deconvolution (LSD; Donati et al. 1997). For 24 studied stars, we have obtained 21 detections of Stokes V Zeeman signatures (data quality and phase coverage may explain our lack of detection of any field in some objects). Our results suggest that all Ap stars are magnetic and, furthermore, that there may exist a minimum field strength for which Ap-type characteristics are produced.

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