J/A+A/687/A146 Entropy-calibrated stellar modeling (Manchon+, 2024)
Entropy-calibrated stellar modeling: Testing and improving the use
of prescriptions for the entropy of adiabatic convection.
Manchon L., Deal M., Goupil M.-J., Serenelli A., Lebreton Y., Klevas J.,
Kucinskas A., Ludwig H.-G., Montalban J., Gizon L.
<Astron. Astrophys. 687, A146 (2024)>
=2024A&A...687A.146M 2024A&A...687A.146M (SIMBAD/NED BibCode)
ADC_Keywords: Models, atmosphere; Stars, late-type
Keywords: convection - stars: evolution - stars: fundamental parameters -
stars: interiors - methods: numerical
Abstract:
Modeling the convection process is a long-standing problem in stellar
physics. To date, all ad hoc models have relied on a free parameter,
alpha, (among others) that has no real physical justification and is
therefore poorly constrained. We implemented the entropy-calibration
method into the stellar evolution code (Cesam2k20) and performed
comparisons with the Sun and the alpha Cen system. In addition, we
used data from the CIFIST grid of 3D atmosphere models to evaluate the
accuracy of the prescriptions. We provide a data table with entropy of
the adiabat of the CIFIST grid. The 104 models range in effective
temperature from 4000K to 6800K, in log of surface gravity from 1.5dex
to 4.5dex and in metallicity [Fe/H] from -3dex to 0.5dex.
Description:
Main characteristics of 3D atmosphere models in the CIFIST grid. The
3D atmosphere models were computed with the RHD code CO5BOLD (Freytag
et al., 2002AN....323..213F 2002AN....323..213F, 2012JCoPh.231..919F 2012JCoPh.231..919F Wedemeyer et al.,
2004A&A...414.1121W 2004A&A...414.1121W).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 81 104 3D atmosphere model parameters
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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 Effective temperature
10- 16 F7.5 [cm/s2] logg logarithmic surface gravity (log_10)
19- 22 F4.1 [Sun] [Fe/H] Metallicity
25- 35 E11.5 10-7W/g/K sRHD Input entropy of the model, i.e. the entropy
of the inflowing gas
38- 48 E11.5 10-7W/g/K sbot Horizontally averaged entropy at the bottom
of the simulation domain
51- 59 F9.2 K Tbot Horizontally averaged temperature at
the bottom of the simulation domain
62- 68 F7.5 [dyn/cm2] logpbot Horizontally averaged logarithmic pressure at
the bottom of the simulation domain (log_10)
71- 81 E11.5 g/cm3 rhobot Horizontally averaged density at
the bottom of the simulation domain
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Acknowledgements:
Louis Manchon, louis.manchon(at)obspm.fr
(End) Patricia Vannier [CDS] 08-May-2024