4 papers
Chemical composition of evolved stars in the open cluster M 67
G. Tautvaisiene, B. Edvardsson, I. Tuominen +1
High-resolution spectra of six core helium-burning `clump' stars and three giants in the open cluster M 67 have been obtained with the SOFIN spectrograph on the Nordic Optical Tele…
Optical properties of carbon grains: Influence on dynamical models of AGB stars
Anja C. Andersen, Rita Loidl, Susanne Hofner
For amorphous carbon several laboratory extinction data are available, which show quite a wide range of differences due to the structural complexity of this material. We have calcu…
iota Cas: Multi-element Doppler imaging and magnetic field geometry
R. Kuschnig, G. A. Wade, G. M. Hill +1
In order to clarify the role of the magnetic field in generating abundance inhomogeneities in the atmospheres of Ap stars, we present new abundance Doppler images and an approximat…
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…