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Chemically peculiar stars of the mercury-manganese (HgMn) type represent anew class of spotted late-B stars, in which evolving surface chemicalinhomogeneities are apparently unrelated to the presence of strong magneticfields but are produced by some hitherto unknown astrophysical mechanism. Thegoal of this study is to perform a detailed line profile variability analysisand carry out a sensitive magnetic field search for one of the brightest HgMnstars - mu Lep. We acquired a set of very high-quality intensity andpolarization spectra of mu Lep with the HARPSpol polarimeter. These data wereanalyzed with the multiline technique of least-squares deconvolution in orderto extract information on the magnetic field and line profile variability. Ourspectra show very weak but definite variability in the lines of Sc, all Fe-peakelements represented in the spectrum of mu Lep, as well as Y, Sr, and Hg.Variability might also be present in the lines of Si and Mg. Anomalous profileshapes of Ti II and Y II lines suggest a dominant axisymmetric distribution ofthese elements. At the same time, we found no evidence of the magnetic field inmu Lep, with the 3 sigma upper limit of only 3 G for the mean longitudinalmagnetic field. This is the most stringent upper limit on the possible magneticfield derived for a spotted HgMn star. The very weak variability detected formany elements in the spectrum mu Lep suggests that low-contrast chemicalinhomogeneities may be common in HgMn stars and that they have not beenrecognized until now due to the limited precision of previous spectroscopicobservations and a lack of time-series data. The null result of the magneticfield search reinforces the conclusion that formation of chemical spots in HgMnstars is not magnetically driven.

No magnetic field in the spotted HgMn star mu Leporis