On the impact of the structural surface effect on global stellar properties and asteroseismic analyses

Abstract

In a series of papers, we have recently demonstrated that it is possible to construct stellar structure models that robustly mimic the stratification of multi-dimensional radiative magneto-hydrodynamic simulations at every time-step of the computed evolution. The resulting models offer a more realistic depiction of the near-surface layers of stars with convective envelopes than parameterizations, such as mixing length theory, do. In this paper, we explore how this model improvement impacts on seismic and non-seismic properties of stellar models across the Hertzsprung-Russell diagram. We show that the improved description of the outer boundary layers alters the predicted global stellar properties at different evolutionary stages. In a hare and hound exercise, we show that this plays a key role for asteroseismic analyses, as it, for instance, often shifts the inferred stellar age estimates by more than 10 per cent. Improper boundary conditions may thus introduce systematic errors that exceed the required accuracy of the PLATO space mission. Moreover, we discuss different approximations for how to compute stellar oscillation frequencies. We demonstrate that the so-called gas ${\Gamma }_1$ approximation performs reasonably well for all main-sequence stars. Using a Monte Carlo approach, we show that the model frequencies of our hybrid solar models are consistent with observations within the uncertainties of the global solar parameters when using the so-called reduced ${\Gamma }_1$ approximation.

Submitted to MNRAS

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• Surface effects and turbulent pressure. Assessing the Gas-${\Gamma }_1$ and Reduced-${\Gamma }_1$ empirical models
• Influence of the magnetic activity cycle on mean density and acoustic radius inversions
• Asteroseismogyrometry of low-mass red giants I. The SOLA inversion method
• Frequency separation ratios do not suppress magnetic activity effects in solar-like stars
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• Glitch analysis and asteroseismic modelling of subgiant $\mu$ Herculis: confirming and interpreting the ${\Gamma }_1$ peak as the helium glitch
• Advanced asteroseismic modelling: breaking the degeneracy between stellar mass and initial helium abundance
• Asteroseismic Analysis of a Red Giant KIC 9145955 by Including the Small-scale Magnetic Fields in the Atmosphere
• PLATO Hare-and-Hounds exercise: Asteroseismic model fitting of main-sequence solar-like pulsators