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Line formation in CO5BOLD simulation of red supergiant

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. RSG have complex spectra …. - strong molecular bands (TiO ...)

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Line formation in CO5BOLD simulation of red supergiant

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  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

  6. Very Strong Line (Fe I)

  7. Very Strong Line

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

  9. Pseudo-Continuum Line

  10. Strong line

  11. Weak Line

  12. 2 1 Pseudo Continuum line 4 3

  13. 2 1 Strong line 4 3

  14. Problems Additional microturbolence 5 km/s No microturbolence Additional microturbolence 1.5 km/s

  15. 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

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

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