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Astron. Astrophys. Suppl. Ser.
Volume 120, Number 3, December_II 1996
Page(s) 457 - 562
The ***3984 feature in late-B spectroscopic binaries DOI: 10.1051/aas:1996306

Astronomy and Astrophysics Supplement Series, Vol. 120, December II 1996, 457-462

The 3984 feature in late-B spectroscopic gif binaries

S. Hubrig and G. Mathys
Send offprint requests to: G. Mathys

University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany
European Southern Observatory, Casilla 19001, Santiago 19, Chile

Received March 6; accepted May 14, 1996


We report about a spectroscopic study aimed at searching the line Hg 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

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