Fig. 13.
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Progenitor modelling of AT 2021biy. Left: Hertzsprung-Russell diagram (HRD) for the progenitor candidate for AT 2021biy. A set of single-star models is shown in red and labeled with their ZAMS mass, while binary models that match the progenitor magnitude and colour are shown as black lines. The point at which each model matches the observed progenitor photometry is marked in green. Right: the ZAMS mass of the primary and secondary for BPASS models that match the progenitor candidate.
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