Model-independent measurement of internal stellar structure in 16 Cygni A and B

Abstract

We present a method for measuring internal stellar structure based on asteroseismology that we call "inversions for agreement." The method accounts for imprecise estimates of stellar mass and radius as well as the relatively limited oscillation mode sets that are available for distant stars. By construction, the results of the method are independent of stellar models. We apply this method to measure the isothermal sound speeds in the cores of the solar-type stars 16 Cyg A and B using asteroseismic data obtained from Kepler observations. We compare the asteroseismic structure that we deduce against best-fitting evolutionary models and find that the sound speeds in the cores of these stars exceed those of the models.

Accepted for publication in The Astrophysical Journal

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Cited by in corpus (25)

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• Differential Modelling Systematics across the HR Diagram from Asteroseismic Surface Corrections
• Thorough characterisation of the 16 Cygni system. Part II. Seismic inversions of the internal structure
• Asteroseismic Inference of the Central Structure in a Subgiant Star
• On the feasibility of structure inversions for gravity-mode pulsators
• Uncertainties and biases in modelling 16 Cyg A and B
• Detailed abundances of the wide pairs of stars with and without planets: the binary systems 16 Cyg and HD 219542
• Improved asteroseismic inversions for red-giant surface rotation rates
• Asteroseismic analysis of 15 solar-like oscillating evolved stars
• Asteroseismic Inversions for Internal Sound Speed Profiles of Main-sequence Stars with Radiative Cores
• Two's a crowd? Characterising the effect of photometric contamination on the extraction of the global asteroseismic parameter ${\nu }_{\text{max}}$ in red-giant binaries
• Influence of the magnetic activity cycle on mean density and acoustic radius inversions
• Detecting active latitudes of Sun-like stars using asteroseismic a-coefficients
• Weighing stars from birth to death: mass determination methods across the HRD
• Inverse analysis of asteroseismic data: a review
• Asteroseismic Structure Inversions of Main-Sequence Solar-like Oscillators with Convective Cores
• Red giant asteroseismic binaries in the Kepler field
• Asteroseismology
• Some musings on erythrogigantoacoustics
• Probing stellar cores from inversions of frequency separation ratios
• Advanced asteroseismic modelling: breaking the degeneracy between stellar mass and initial helium abundance