The λ 3984 feature in late-B spectroscopic binaries*
University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
2 European Southern Observatory, Casilla 19001, Santiago 19, Chile
Send offprint request to: G. Mathys
Accepted: 14 May 1996
We report about a spectroscopic study aimed at searching the line 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.
Key words: stars: chemically peculiar / binaries: spectroscopic / stars: rotation
© European Southern Observatory (ESO), 1996