A Star in the M31 Giant Stream: the Highest Negative Stellar Velocity Known
Cosmology and Nongalactic Astrophysics
2015-05-14 v1 Solar and Stellar Astrophysics
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.
Keywords
Cite
@article{arxiv.0911.3177,
title = {A Star in the M31 Giant Stream: the Highest Negative Stellar Velocity Known},
author = {N. Caldwell and H. Morrison and S. J. Kenyon and R. Schiavon and P. Harding and J. A. Rose},
journal= {arXiv preprint arXiv:0911.3177},
year = {2015}
}
Comments
to appear in AJ