A Massive Yellow Supergiant in the Far Outer Disk of M31: Evidence for in Situ Massive Star Formation Beyond the Optical Radius
Pinjian Chen et al 2025 AJ 170 89 The discovery of an 18-solar-mass star at 34 kiloparsecs from the center of the Andromeda Galaxy, along with a wispy arm of hydrogen gas, suggest that massive stars…
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