Critical mass per cross section (σ*) for a photon sail to escape from a main-sequence star into interstellar space. The value of σ⊙ from Eq. (7) is in black. The values of α Cen A, B, and C (=Proxima Cen) are in red. The dots that are connected by a line use the stellar evolution models of Baraffe et al. (2015).
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