J/A+A/560/A8 STAGGER-grid of 3D stellar models. II. (Magic+, 2013)
The STAGGER-grid: A grid of 3D stellar atmosphere models.
II. Horizontal and temporal averaging and spectral line formation.
Magic Z., Collet R., Hayek W., Asplund M.
<Astron. Astrophys. 560, A8 (2013)>
=2013A&A...560A...8M 2013A&A...560A...8M
ADC_Keywords: Models, atmosphere ; Stars, late-type
Keywords: convection - hydrodynamics - radiative transfer -line: formation -
stars: abundances - stars: atmospheres
Abstract:
We study the implications of averaging methods with different
reference depth scales for 3D hydrodynamical model atmospheres
computed with the Stagger-code. The temporally and spatially averaged
(hereafter denoted as <3D>) models are explored in the light of
local thermodynamic equilibrium (LTE) spectral line formation by
comparing spectrum calculations using full 3D atmosphere structures
with those from <3D> averages.
We explored methods for computing mean <3D> stratifications from the
Stagger-grid time-dependent 3D radiative hydrodynamical atmosphere
models by considering four different reference depth scales
(geometrical depth, column-mass density, and two optical depth
scales). Furthermore, we investigated the influence of alternative
averages (logarithmic, enforced hydrostatic equilibrium, flux-weighted
temperatures). For the line formation we computed curves of growth for
FeI and FeII lines in LTE.
Description:
More (updated) information and data available at:
http://www.stagger-stars.net/
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stagh500.dat 99 14484 Results with optical depth at 500nm averaging (o)
staghm.dat 99 14484 Results with column mass density averaging (m)
staghros.dat 99 14484 Results with Rosseland optical depth averaging (R)
staghz.dat 99 14484 Results with geometrical depth averaging (z)
prog/* . 5 Original files with reading program
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See also:
J/A+A/557/A26 : STAGGER-grid of 3D stellar models. I. (Magic+, 2013)
http://www.stagger-stars.net/ : Stagger stars Home Page
Byte-by-byte Description of file: stagh500.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 K Teffi [3935/7053] Effective temperature
(input parameter)
9- 12 F4.2 [cm/s2] loggi [1.5/5] Surface gravity (input parameter)
14- 18 F5.2 [Sun] [Fe/H]i [-4/0.5] Metallicity (input parameter)
20- 30 A11 --- Model Model name
32- 35 A4 --- --- [500 ]
37- 41 F5.2 [-] logtau [-5/2] log(τ) (τ is the optical depth)
43- 51 F9.3 K T(o) Temperature at 500nm optical depth τ
54- 63 E10.5 g/cm3 rho(o) Density ρ at 500nm optical depth τ
66- 75 E10.5 dPa Pth(o) Thermodynamic pressure [dyne/cm2] at τ
78- 87 E10.5 dPa Ptb(o) Turbulent pressure [dyne/cm2] at τ
90- 99 E10.5 dPa Pe(o) Electron pressure [dyne/cm2] at τ
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Byte-by-byte Description of file: staghm.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 K Teffi [3935/7053] Effective temperature
(input parameter)
9- 12 F4.2 [cm/s2] loggi [1.5/5] Surface gravity (input parameter)
14- 18 F5.2 [Sun] [Fe/H]i [-4/0.5] Metallicity (input parameter)
20- 30 A11 --- Model Model name,
32- 35 A4 --- --- [m ]
37- 41 F5.2 [-] logtau [-5/2] log(τ) (τ is the optical depth)
43- 51 F9.3 K T(m) Temperature at Mean Rosseland optical depth
τ, column mass density averaged
54- 63 E10.5 g/cm3 rho(m) Density ρ at τ
66- 75 E10.5 dPa Pth(m) Thermodynamic pressure [dyne/cm2] at τ
78- 87 E10.5 dPa Ptb(m) Turbulent pressure [dyne/cm2] at τ
90- 99 E10.5 dPa Pe(m) Electron pressure [dyne/cm2] at τ
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Byte-by-byte Description of file: staghros.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 K Teffi [3935/7053] Effective temperature
(input parameter)
9- 12 F4.2 [cm/s2] loggi [1.5/5] Surface gravity (input parameter)
14- 18 F5.2 [Sun] [Fe/H]i [-4/0.5] Metallicity (input parameter)
20- 30 A11 --- Model Model name,
32- 35 A4 --- --- [ross]
37- 41 F5.2 [-] logtau [-5/2] log(τ) (τ is the optical depth)
43- 51 F9.3 K T(R) Temperature at Rosseland optical depth τ,
Rosseland optical depth averaged
54- 63 E10.5 g/cm3 rho(R) Density ρ at τ
66- 75 E10.5 dPa Pth(R) Thermodynamic pressure [dyne/cm2] at τ
78- 87 E10.5 dPa Ptb(R) Turbulent pressure [dyne/cm2] at τ
90- 99 E10.5 dPa Pe(R) Electron pressure [dyne/cm2] at τ
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Byte-by-byte Description of file: staghz.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.2 K Teffi [3935/7053] Effective temperature
(input parameter)
9- 12 F4.2 [cm/s2] loggi [1.5/5] Surface gravity (input parameter)
14- 18 F5.2 [Sun] [Fe/H]i [-4/0.5] Metallicity (input parameter)
20- 30 A11 --- Model Model name,
32- 35 A4 --- --- [z ]
37- 41 F5.2 [-] logtau [-5/2] log(τ) (τ is the optical depth)
43- 51 F9.3 K T(z) Temperature at Mean Rosseland optical depth
τ, geometrical height averaged
54- 63 E10.5 g/cm3 rho(z) Density ρ at τ
66- 75 E10.5 dPa Pth(z) Thermodynamic pressure [dyne/cm2] at τ
78- 87 E10.5 dPa Ptb(z) Turbulent pressure [dyne/cm2] at τ
90- 99 E10.5 dPa Pe(z) Electron pressure [dyne/cm2] at τ
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Acknowledgements:
Zazralt Magic, magic (at)mpa-garching.mpg.de
(End) Patricia Vannier [CDS] 18-Oct-2013