A roughly 18 solar mass yellow supergiant at 34 kpc from M31's center, moving with a faint outer hydrogen arm, is the most distant massive star known in the galaxy and points to in situ formation beyond the optical radius.
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A Massive Yellow Supergiant in the Far Outer Disk of M31: Evidence for In Situ Massive Star Formation Beyond the Optical Radius
A roughly 18 solar mass yellow supergiant at 34 kpc from M31's center, moving with a faint outer hydrogen arm, is the most distant massive star known in the galaxy and points to in situ formation beyond the optical radius.