3 papers
astro-ph1998
Multi-element Doppler imaging of kappa Psc
N. Piskunov, H. C. Stempels, T. A. Ryabchikova +2
kappa Psc (HD 220825) is a typical Chromium Ap star that happens to have optimal parameters for Doppler imaging (DI). Its short rotational period of less then 2 days, rotational ve…
astro-ph1998
Eu III identification and Eu abundance in cool CP stars
T. Ryabchikova, N. Piskunov, I. Savanov +1
We report the first identification of the Eu III lambda 6666.317 line in optical spectra of CP stars. This line is clearly present in the spectra of HR 4816, 73 Dra, HR 7575, and b…
astro-ph1998
CP star atmospheres based on individual ODFs
F. Kupka, N. E. Piskunov
We describe a new method for the computation of opacity distribution functions (ODFs) useful to calculate one-dimensional model atmospheres in local thermal equilibrium (LTE). The…