10 citations · 18 across the 10 of their papers we have counts for
9 papers · 1 filter
3D spectral synthesis and rotational line broadening
Hans-G. Ludwig
Spectral synthesis calculations based on three-dimensional stellar atmosphere models are limited by the affordable angular resolution of the radiation field. This hampers an accura…
The shock-patterned solar chromosphere in the light of ALMA
S. Wedemeyer-Boehm, H. -G. Ludwig, M. Steffen +2
Recent three-dimensional radiation hydrodynamic simulations by Wedemeyer et al. (2004) suggest that the solar chromosphere is highly structured in space and time on scales of only…
3D Simulation of Convection and Spectral Line Formation in A-type Stars
M. Steffen, B. Freytag, H. -G. Ludwig
We present first realistic numerical simulations of 3D radiative convection in the surface layers of main sequence A-type stars with Teff = 8000 K and 8500 K, log g = 4.4 and 4.0,…
Theoretical modelling of late-type giant atmospheres: preparing for Gaia
A. Kucinskas, I. Brott, P. H. Hauschildt +4
Late type giants (RGB/AGB stars) will be important tracers of the Galactic morphology and evolution in the framework of Gaia, as they are intrinsically bright and thus can probe di…
Status and future of hydrodynamical model atmospheres
H. -G. Ludwig, A. Kucinskas
Since about 25 years ago work has been dedicated to the development of hydrodynamical model atmospheres for cool stars (of A to T spectral type). Despite their obviously sounder ph…
Wavelength Shifts in Solar-Type Spectra
D. Dravins, L. Lindegren, H. -G. Ludwig +1
Spectral-line displacements away from the wavelengths naively expected from the Doppler shift caused by stellar radial motion may originate as convective shifts (correlated velocit…