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The properties of the central star of NGC 6543.

Grewing, M.; Bianchi, L.; Cerrato, S.

The nucleus of NGC 6543 has been classified as a WR+Of star. From low dispersion ultraviolet spectra taken with the IUE, the authors determined its temperature (T = 80,000K) and luminosity (log L/L_sun; = 4.18). High solution spectra, also taken with the IUE, were used to study in detail the mass loss from the nucleus. The wind velocity was found …

Abondances NLTE de Ca, Mg, C, Si dans quelques étoiles A.

Freire Ferrero, R.

Some results on Ca, Mg, C and Si abundances are given for some A stars of the solar neighbourhood. The abundances are determined via the comparison of computed and observed line resonance profiles, in the framework of the NLTE theory, with atom models reduced to a few atomic levels. The obtained NLTE abundance values are then compared to the LTE o…