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

Abstract

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.

to appear in AJ

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Cited by in corpus (6)

• The SPLASH Survey: Kinematics of Andromeda's Inner Spheroid
• Hypervelocity Star Candidates in the SEGUE G & K Dwarf Sample
• Chemical Abundances of Planetary Nebulae in the Substructures of M31
• Kinematics in galactic tidal tails - A source for Hypervelocity stars?
• Chemical Abundances of Planetary Nebulae in the Substructures of M31 -- II. The Extended Sample and A Comparison Study with the Outer-disk Group
• A Globular Cluster Toward M87 with a Radial Velocity < -1000 km/s: The First Hypervelocity Cluster