J/A+A/573/A89 STAGGER-grid of 3D stellar models. III. (Magic+, 2015)
The Stagger-grid: A grid of 3D stellar atmosphere models.
III. The relation to mixing-length convection theory.
Magic Z., Weiss A., Asplund M.
<Astron. Astrophys. 573, A89 (2015)>
=2015A&A...573A..89M 2015A&A...573A..89M
ADC_Keywords: Models, atmosphere ; Stars, late-type
Keywords: convection - hydrodynamics - stars: atmospheres - stars: evolution -
stars: late-type - stars: solar-type
Abstract:
We investigate the relation between 1D atmosphere models that rely on
the mixing length theory and models based on full 3D radiative
hydrodynamic (RHD) calculations to describe convection in the
envelopes of late-type stars.
The adiabatic entropy value of the deep convection zone, sbot, and
the entropy jump, Δs, determined from the 3D RHD models, are
matched with the mixing length parameter, αMLT, from 1D
hydrostatic atmosphere models with identical microphysics (opacities
and equation-of-state). We also derive the mass mixing length,
αm, and the vertical correlation length of the vertical
velocity, C[Vz,Vz], directly from the 3D hydrodynamical
simulations of stellar subsurface convection.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 141 204 Stellar parameters
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See also:
J/A+A/557/A26 : STAGGER-grid of 3D stellar models. I. (Magic+, 2013)
J/A+A/560/A8 : STAGGER-grid of 3D stellar models. II. (Magic+, 2013)
J/A+A/573/A90 : STAGGER-grid of 3D stellar models. III. (Magic+, 2015)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 K Teff [3935/7053] Effective temperature
11- 14 F4.2 [cm/s2] logg [1.5/5] Surface gravity
17- 21 F5.2 [Sun] [Fe/H] [-4/0.5] Metallicity
25- 31 F7.5 [dg/m3] lgrbot [0.04/4.23] Logarithmic bottom density
log(ρbot), in 10-7g/cm3
35- 41 F7.5 [K] lgTbot [0.49/4.70] Logarithmic bottom temperature
log(Tbot)
45- 51 F7.5 [10+4Pa] lgPbot [0.49/4.27] Logarithmic bottom thermodynamic
pressure log(gPthbot), in 105dyne/cm2
55- 61 F7.5 hJ/g/K sbot [1.06/2.76] Entropy at the bottom sbot,
in 109erg/g/K
64- 71 F8.5 hJ/g/K Ds Entropy jump Δs, in 10+9erg/g/K
74- 81 F8.5 % dsrms Maximal rms-entropy δsrmspeak
84- 91 F8.5 % drrms Maximal rms-density δρrmspeak
95-101 F7.5 km/s dVzrms Maximal rms-velocity δVz,rmspeak
105-111 F7.5 --- a(sbot) [0/2.4] Mixing length parameter
αMLTsbot
115-121 F7.5 --- a(Ds) [0/2.9] Mixing length parameter
αMLTΔs
125-131 F7.5 --- am [0/7.9] Mass mixing length αm
135-141 F7.5 --- W(Vz)/HP [0/2.1] Correlation length W(Vz)/HP
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Acknowledgements:
Zaz Magic, magic(at)MPA-Garching.MPG.DE
References:
Magic et al., Paper I 2013A&A...557A..26M 2013A&A...557A..26M, Cat. J/A+A/557/A26
Magic et al., Paper II 2013A&A...560A...8M 2013A&A...560A...8M, Cat. J/A+A/560/A8
Magic et al., Paper IV 2015A&A...573A..90M 2015A&A...573A..90M, Cat. J/A+A/573/A90
(End) Patricia Vannier [CDS] 03-Oct-2014