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6. Conclusions

Our observations confirm the presence of CS gas around eight tex2html_wrap_inline1683 Bootis stars, more particularly among the most rapid rotators. This is in line with the recent study of Holweger & Rentzsch-Holm (1995), who conclude that these stars are in the pre-main-sequence phase of evolution. Furthermore, our data show that the intensity of the CS component is variable on a timescale of months or years. As the actual time resolution of the observations does not cover a timescale of days we cannot arrive at a conclusion for this timescale. The analysis of the photometric data confirms that four tex2html_wrap_inline1683 Bootis candidates can be excluded from the tex2html_wrap_inline1683 Bootis group.


This research has made use of the SIMBAD database, operated at the CDS, Strasbourg, France. One of us (BH) is grateful to the Fonds National suisse de la Recherche Scientifique, which gave its support to part of the research.

Copyright by the European Southern Observatory (ESO)