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A&A Supplement series, Vol. 123, May II 1997, 93-101

Received June 14; accepted September 10, 1996

A consolidated catalogue of tex2html_wrap_inline1840 Bootis starsgif

E. Paunzen tex2html_wrap1870, W.W. Weiss tex2html_wrap1872, U. Heiter tex2html_wrap1874, and P. North tex2html_wrap1876

Send offprint request: E. Paunzen

tex2html_wrap1878  Institut für Astronomie, Türkenschanzstr. 17, A-1180 Wien, Austria
tex2html_wrap1880  Institut d'Astronomie de l'Université de Lausanne, CH-1290 Chavannes-des-Bois, Switzerland


tex2html_wrap_inline1844Bootis stars challenge our understanding of diffusion and accretion processes related to stars and their circumstellar environment, and they are interesting components of the classical instability strip. Attempts to derive group properties with statistical methods are severely limited by the small number of unambiguously identified tex2html_wrap_inline1846Bootis stars. In general, the subject appears to be obscured by incorrect memberships and it is therefore essential to provide a sufficiently large catalogue of definitive group members before modeling the tex2html_wrap_inline1848Bootis phenomenon.
This paper describes the first steps towards this goal, based on our current knowledge of well investigated members, leading to a concise definition of tex2html_wrap_inline1850Bootis stars: PopI hydrogen burning metal poor (except of C,N,O and S) A-type stars. The definition does not depend on phenomenological features, like flux depressions, colour excesses, tex2html_wrap_inline1852 values, etc.
Based on a new homogeneous catalogue with 45 tex2html_wrap_inline1854Bootis stars, we discuss classification criteria which can be used for a spectroscopic and photometric all-sky survey for tex2html_wrap_inline1856Bootis stars in the field and in clusters of different ages.

keywords: astronomical data bases -- catalogues; stars -- tex2html_wrap_inline1858Bootis\; stars -- chemically peculiar; stars -- early type

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