Extended Data Fig. 1: Observed spectrum of J1010+2358.
From: A metal-poor star with abundances from a pair-instability supernova
The observed spectrum of J1010+2358 (filled circles: Teff = 5,860 K; log g = 3.6; [Fe/H] = −2.42) are shown with a comparison star J0626+6032 (blue lines: Teff = 5,863 K; log g = 3.73; [Fe/H] = −2.39). The chemical abundances ([Na/Fe] = +0.89 ± 0.08; [Mg/Fe] = +0.21 ± 0.06; [Ba/Fe] = +0.23 ± 0.06) of J0626+6032 are normal as a VMP star. The black lines are synthetic spectra with [Na/Fe] = −2.02 ± 0.3 (a), [Mg/Fe] = −0.66 ± 0.3 (b) and [Ba/Fe] = −1.37 ± 0.3 (c).
