Abstract. The Catalogue, available at the Centre de Données Stellaires de Strasbourg , consists of 13 573 records concerning the results obtained from different methods for 7778 stars, reported in the literature. The following data are listed for each star: identifications, apparent magnitude, spectral type, apparent diameter in arcsec, absolute radius in solar units, method of determination, reference, remarks. Comments and statistics obtained from CADARS are given.

We have carried out high-resolution, long-wavelength ZUE observations and ground-based photometry of the 6 Scuti star Cas. The ground-based observations were used together with previous results of Antonello et al. to ensure that the ZUE observations were correctly phased relative to the photometric variation. Fluxes for the emission core of the Mg 11 k 12796 line were obtained from the ultraviolet spectra over several cycles in 1986 and 1987. We found that there is an increase in the emission during part of the cycle but it occurs near minimum light in contrast to another 6 Scuti star, p Pup, and the classical Cepheids where it occurs near maximum light. The mean level of chromospheric activity is comparable to other early F dwarfs.

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