HR-diagram showing the lowest χ² models (crosses). The models with low χ² and lying near the star’s location in the HR-diagram are shown with filled circles whose radii are inversely proportional to χ². Also shown are PMS evolutionary tracks with the indicated masses (M_⊙) and the birthline. HD 261711’s observational HR-diagram position including uncertainties was derived using the spectroscopically determined value of logT_eff  and the asteroseismic radius of 1.65 R_⊙.