Fig. 3: Elemental mass ratios in Cas A compared with those in SN nucleosynthesis models.
From: Chlorine and potassium enrichment in the Cassiopeia A supernova remnant
Red circles with error bars represent the mass ratios relative to Ar derived from different regions shown in Fig. 1. The error bar shows a 1σ statistical uncertainty. The grey region indicates the range predicted by core-collapse SN nucleosynthesis models in ref. 20, assuming single-star, non-rotating progenitors with solar metallicity and initial masses in the range of 13–25M⊙. To facilitate comparison between the observed values and the model values, only the model values are connected and that range is shaded. See Extended Data Fig. 2 for a more comprehensive comparison across a wider range of model parameters.
