Extended Data Fig. 1: A portion of the reduced spectra of an example co-moving pair of stars (HD 185726/185689; Pair 124).
From: At least one in a dozen stars shows evidence of planetary ingestion
The spectra of HD 185726 and HD 185689 are plotted in dark green and orange, respectively. The stellar parameters of these two stars are: [Teff = 6271 K; \(\log \,g\) = 4.2 cm s−2; [Fe/H] = −0.364 dex] for HD 185726, and [Teff = 6132 K; \(\log \,g\) = 4.36 cm s−2; [Fe/H] = −0.207 dex] for HD 185689. Representative lines of oxygen, iron, silicon, and nickel adopted in this analysis are marked out. It demonstrates that even at the level of a few percent, the differences in line strengths (for different elements) between two stars can be clearly revealed, if they exist.
