EDP Sciences
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Volume 396, Number 1, December II 2002
Page(s) 131 - 141
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021425

A&A 396, 131-141 (2002)
DOI: 10.1051/0004-6361:20021425

Magnetic survey of bright northern main sequence stars

D. N. Monin, S. N. Fabrika and G. G. Valyavin

Special Astrophysical Observatory of Russian AS, Nizhnij Arkhyz 369167, Russia
(Received 26 June 2000 / Accepted 30 August 2002)

The first results of a systematic search for magnetic fields in the brightest upper main sequence (MS) stars are presented. The main goal is to survey the stars with about the same detection limit and to improve existing statistics of their magnetism. The target list contains 57 upper MS stars and represents well B0.5-F9 stars. High-resolution Zeeman spectra were obtained for 30 stars of the list. The accuracy of the magnetic field measurements ranges from 20 to 300 G depending mainly on spectral class. In the majority of studied stars we did not detect magnetic fields. In some stars we suspect the presence of a weak magnetic field. These are the best candidates for more extensive studies. A particular case is the star $\chi$ Dra where we probably detected the global magnetic field. The longitudinal field strength is $B_{\rm l}= -54\pm12$ G. Further observations of this star are needed to confirm the detection and to ascertain if the magnetic field is variable with the period of rotation.

Key words: stars: magnetic fields -- surveys

Offprint request: D. N. Monin, mosha@sao.ru

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