Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-20
Astronomy and Astrophysics
Astrophysics
5 pages, 6 figures; to appear in Mem. Soc. Astr. Italiana, Vol. 79/2 (proc. Cefalu' Workshop on "XXI Century Challenges for St
Scientific paper
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 convection simulations as time-dependent, hydrodynamical, model atmospheres to compute spectral line profiles for a number of ions and molecules under the assumption of local thermodynamic equilibrium (LTE). We compare the results with the predictions of line formation calculations based on 1D, hydrostatic, model stellar atmospheres in order to estimate the impact of 3D models on the derivation of elemental abundances. We find large negative 3D-1D LTE abundance corrections (typically -0.5 to -1 dex) for weak low-excitation lines from molecules and neutral species in the very low metallicity cases. Finally, we discuss the extent of departures from LTE in the case of neutral iron spectral line formation.
Asplund Martin
Collet Remo
Trampedach Regner
No associations
LandOfFree
Beyond 1D: spectral line formation with 3D hydrodynamical model atmospheres of red giants does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Beyond 1D: spectral line formation with 3D hydrodynamical model atmospheres of red giants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Beyond 1D: spectral line formation with 3D hydrodynamical model atmospheres of red giants will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-392162