SIMBAD references

We report about a spectroscopic study aimed at searching the line Hg II λ 3984 in a sample of 28 spectroscopic binaries with primaries in the same temperature range as HgMn stars. One system, HD 75642, shows this line very prominently. In another system, HD 41040, Hg may be somewhat overabundant, while HD 87751 shows marginal Mn and P enhancement. The present study does not bring a definitive answer to the question of the relation between binarity, slow rotation, and the appearance of HgMn anomalies in late B stars, possibly because other effects (like the influence of a magnetic field), which could not be taken into consideration, are important too. In the course of this study, 11 new double-lined spectroscopic binaries were discovered, 10 of which were previously known as single-lined systems. Of particular interest among them are 4 stars that may have the Si or He weak peculiarities.