Accurate measurements of the mean longitudinal component of the photospheric magnetic field for 26 late-type stars have been obtained by a multiline Zeeman polarimetric technique. None except those chosen as magnetic standards exhibits clear evidence of a magnetic field, although three show marginally significant polarizations. The multiline Zeeman polarimetric technique is shown to be an extraordinarily sensitive method for the detection of magnetic fields on cool stars.
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Brown et al. (1981) studied this question.