8 papers · 1 filter
Beyond 1D: spectral line formation with 3D hydrodynamical model atmospheres of red giants
R. Collet, M. Asplund, R. Trampedach
We present the results of realistic, 3D, hydrodynamical, simulations of surface convection in red giant stars with varying effective temperatures and metallicities. We use the conv…
Oscillation power spectra of the Sun and of Alpha Cen A: observations versus models
R. Samadi, M. J. Goupil, F. Baudin +4
Hydrodynamical, 3D simulations of the outer layers of the Sun and Alpha Cen A are used to obtain constraints on the properties of turbulent convection in such stars. These constrai…
Line formation in solar granulation: II. The photospheric Fe abundance
M. Asplund, AA. Nordlund, R. Trampedach +1
The solar photospheric Fe abundance has been determined using realistic ab initio 3D, time-dependent, hydrodynamical model atmospheres. The study is based on the excellent agreemen…
Line formation in solar granulation: I. Fe line shapes, shifts and asymmetries
M. Asplund, AA. Nordlund, R. Trampedach +2
Realistic ab-initio 3D, radiative-hydrodynamical convection simulations of the solar granulation have been applied to FeI and FeII line formation. In contrast to classical analyses…
3D hydrodynamical model atmospheres of metal-poor stars: Evidence for a low primordial Li abundance
M. Asplund, AA. Nordlund, R. Trampedach +1
Realistic 3-dimensional (3D), radiative hydrodynamical surface convection simulations of the metal-poor halo stars HD 140283 and HD 84937 have been performed. Due to the dominance…
Test of Convective Frequency Effects with SOI/MDI High-Degree Data
C. S. Rosenthal, J. Christensen-Dalsgaard, A. G. Kosovichev +6
Advances in hydrodynamical simulations have provided new insights into the effects of convection on the frequencies of solar oscillations. As more accurate observations become avai…