Line formation in CO5BOLD simulation of red supergiant
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Transcript of Line formation in CO5BOLD simulation of red supergiant
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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
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RSG have complex spectra …
- strong molecular bands (TiO ...)
- large “macroturbulence” (~15 km s-1)
continuum poorly defined, spectrum synthesis is difficult ...
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1D does not work for RSGs !
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Post-Processing
τλ ijk = χ ijk Tijk , ρijk ,λ ⋅ 1− v ijk / c( )( )1
k
∑ ρijkδzijk
Iλij = Bλ Tijk( )k∑ ⋅exp −τ λijk( )δτ λijk
avec
6.3 sec / λ
(3153 rayons)
R = λ/λ = c/v 85000
~ 30 h / 1000 A
interpolation of ijk
exponential
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Strongline
Pseudo-ContinuumLine
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Very Strong Line (Fe I)
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Very Strong Line
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Weak Line (Si I) Strong Line (Ca I)
Pseduo - Continuum
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Pseudo-ContinuumLine
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Strongline
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Weak Line
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1
43
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Pseudo Continuum line
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1
3 4
2
Strong line
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Problems
No microturbolence
Additional microturbolence
1.5 km/s
Additional microturbolence
5 km/s
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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
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Needs
• Increase model resolution to 5003 points
• Increase model temperature at least to 3600K
• non-grey radiation transport
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