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Uniform characterisation of an ensemble of main-sequence benchmark stars: effect of Gaia -based data on grid search models

2024; Oxford University Press; Linguagem: Inglês

10.1093/mnras/stae2704

1365-2966

Benard Nsamba, Achim Weiß, Juma Kamulali,

Scientific Research and Discoveries

Abstract The inference of stellar parameters (such as radius and mass) through asteroseismic forward modelling depends on the number, accuracy, and precision of seismic and atmospheric constraints. ESA’s Gaia space mission is providing precise parallaxes which yield an additional constraint to be included in the model grid search. Using a handful of main-sequence benchmark stars, we perform a uniform characterisation of these stars. We assess the accuracy and precision of stellar parameters inferred from grid-based searches when a Gaia-based luminosity is combined with different stellar constraints. We also examine the precision needed for an interferometric radius (model-independent radius) to have a significant contribution towards the determination of stellar mass in the optimisation process. Our findings show that more precise stellar masses are inferred for some stars when seismic and spectroscopic constraints are complemented with a Gaia-based luminosity, with a scatter varying from 1.9percnt to 0.8percnt. However, the inferred stellar radii are underestimated when compared to the interferometric radii and yield a scatter of ∼1.9percnt. In addition, we demonstrate that a precisely measured interferometric radius (≲ 1percnt) when applied in the optimisation process yields a mass with a precision ≲ 1.5percnt. Finally, we find that when only l = 0 mode oscillation frequencies are available, robust masses and radii are still attainable. However, this requires precise and numerous l = 0 mode oscillations frequencies (> 8) to be coupled with atmospheric constraints.