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We report on a single star, B030D, observed as part of a large survey ofobjects in M31, which has the unusual radial velocity of -780 km/s. Based ondetails of its spectrum, we find that the star is an F supergiant, with acircumstellar shell. The evolutionary status of the star could be one of apost-mainsequence close binary, a symbiotic nova, or less likely, a post-AGBstar, which additional observations could help sort out. Membership of the starin the Andromeda Giant Stream can explain its highly negative velocity.

A Star in the M31 Giant Stream: the Highest Negative Stellar Velocity Known