About 31-33% of red supergiants in M31 and M33 show ultraviolet excess from hot companions, giving new HST-based binary fractions.
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The Samples and Binary Fractions of Red Supergiant in M31 and M33 by the HST Observations
About 31-33% of red supergiants in M31 and M33 show ultraviolet excess from hot companions, giving new HST-based binary fractions.