7 papers · 1 filter
The formation of G-band bright points. I: Standard LTE modelling
D. Kiselman, R. J. Rutten, B. Plez
Assuming LTE, we synthesise solar G band spectra from the semiempirical flux-tube model of Briand Solanki (1995). The results agree with observed G-band bright-point contrasts with…
Effects of NLTE and granulation on LiBeB abundance determinations
Dan Kiselman
NLTE effects - the errors caused by assuming local thermodynamic equilibrium (LTE) - on LiBeB abundance determinations for cool stars are discussed. These NLTE effects are signific…
The 671 nm Li I line in solar granulation
Dan Kiselman
The astrophysically very interesting Li I 671 nm line has been observed with high spatial resolution in solar granulation with the intention to diagnose departures from local therm…
The NLTE formation of neutral-boron lines in cool stars
Dan Kiselman, Mats Carlsson
We study the formation of B I lines in a grid of cool stellar model atmospheres without the assumption of local thermodynamic equilibrium (LTE). The non-LTE modelling includes the…
A non-LTE study of Li I lines in AGB stars
Dan Kiselman, Bertrand Plez
We study the formation of Li lines in a case study of an S-type AGB star in the SMC. AGB stars may be important providers of Li to the interstellar medium. Abundance analysis o…
Boron in the Extreme Pop II Star HD 140283 and the Production of Light Elements in the Early Galaxy
B. Edvardsson, B. Gustafsson, S. G. Johansson +4
Using observations of the 2496.7 A B I line with the HST GHRS at a nominal resolution of 90,000, we have found the abundance of boron of HD 140283 to be log epsilon_B (= 12 + log (…