1. Line formation in CO5BOLD simulation of red supergiant
A. Chiavassa, B. Plez, E. Josselin,*
B. Freytag**
*GRAAL, Montpellier, France
**LANL, USA; Uppsala University, Sweden
CO5BOLD Workshop, June 2006

2. RSG have complex spectra …
- strong molecular bands (TiO ...)
- large “macroturbulence” (~15 km s-1)
 continuum poorly defined, spectrum synthesis is difficult ...

3. 1D does not work for RSGs !

4. Post-Processing avec 6.3 sec / l (3153 rayons) R = / = c/v  85000
~ 30 h / 1000 A
interpolation of ijk
exponential

5. Pseudo-Continuum
Line
Strong
line

7. Very Strong Line (Fe I)

8. Very Strong Line

9. Pseduo - Continuum
Weak Line (Si I)
Strong Line (Ca I)

10. Pseudo-Continuum
Line

11. Strong
line

12. Weak Line

13. 1 2
Pseudo Continuum line 3 4

14. 1 2
Strong line 3 4

15. Problems Additional microturbolence 5 km/s No microturbolence

16. Conclusions Intensity comes from different regions at different depth
Velocity does not behave the same at different depth
3D models do not reproduce high and low excitation line

17. Needs Increase model resolution to 5003 points
Increase model temperature at least to 3600K
non-grey radiation transport