Calibration of the mixing-length parameter α for the MLT and FST models by matching with CO5BOLD models

• Verfasst von: Sonoi, Takafumi [VerfasserIn]
• Verfasst von: Ludwig, Hans-Günter [VerfasserIn]
• Verfasst von: Caffau, Elisabetta [VerfasserIn]
• Titel: Calibration of the mixing-length parameter α for the MLT and FST models by matching with CO5BOLD models
• Verf.angabe: T. Sonoi, H.-G. Ludwig, M.-A. Dupret, J. Montalbán, R. Samadi, K. Belkacem, E. Caffau, and M.-J. Goupil
• E-Jahr: 2018
• Jahr: 13 Nov 2018
• Umfang: 14 S.
• Fussnoten: Im Titel wird "alpha" als griechischer Buchstabe dargestellt ; Im Titel ist die Zahl 5 hochgestellt ; Gesehen am 20.10.2020
• Titel Quelle: Enthalten in: De.arxiv.org
• Ort Quelle: [S.l.] : Arxiv.org, 1991
• Jahr Quelle: 2018
• Band/Heft Quelle: (2018) Artikel-Nummer 1811.05229, 14 Seiten
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Astrophysics - Solar and Stellar Astrophysics
• K10plus-PPN: 1586502824

Abstract

The CoRoT and Kepler missions provided a wealth of high-quality data for solar-like oscillations. To make the best of such data for seismic inferences, we need theoretical models with precise near-surface structure, which has significant influence on solar-like oscillation frequencies. The mixing-length parameter, $\alpha$, is a key factor for the near-surface structure. In the convection formulations used in evolution codes, the $\alpha$ is a free parameter that needs to be properly specified. We calibrated $\alpha$ values by matching entropy profiles of 1D envelope models with those of 3D CO$^5$BOLD models. For such calibration, previous works concentrated on the classical mixing-length theory (MLT). Here we also analyzed the full spectrum turbulence (FST) models. For the atmosphere part in the 1D models, we use the Eddington grey $T(\tau)$ relation and the one with the solar-calibrated Hopf-like function. For both the MLT and FST models with a mixing length $l=\alpha H_p$, calibrated $\alpha$ values increase with increasing