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

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

2009-11-16

arxiv.org/abs/0911.3177v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

to appear in AJ

Scientific paper

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

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