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We find a linear relationship between the size of a massive star'smain-sequence bubble in a molecular environment and the star's initial mass:R_b \approx 1.22M/Msun - 9.16 pc, assuming a constant interclump pressure.Since stars in the mass range of 8 to 25-30 Msun will end their evolution inthe red supergiant phase without launching a Wolf-Rayet wind, the main-sequencewind-blown bubbles are mainly responsible for the extent of molecular gascavities, while the effect of the photoionization is comparatively small. Thislinear relation can thus be used to infer the masses of the massive starprogenitors of supernova remnants (SNRs) that are discovered to evolve inmolecular cavities, while few other means are available for inferringproperties of SNR progenitors. We have used this method to estimate the initialmasses of the progenitors of eight SNRs: Kes 69, Kes 75, Kes 78, 3C 396, 3C397, HC 40, Vela, and RX J1713-3946.

Linear relation for wind-blown bubble sizes of main-sequence OB stars in a molecular environment and implication for supernova progenitors