The very high resolution and high signal-to-noise ratio spectra of ten x-ray selected stars are obtained by the NAOC Coude spectropraph.Magnetic field measurements of these stars have been performed using the profileaddition technique.The magnetic field strength and filling factor are obtained,and we find that there exist strong magnetic fields on very active stars.
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机译：B fields in OB stars (BOB): on the detection of weak magnetic fields in the two early B-type stars beta CMa and epsilon CMa Possible lack of a "magnetic desert" in massive stars
