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Title:
On the Evidence of Disks around Blue Straggler Stars
Authors:
Porter, John M.; Townsend, R. H. D.
Affiliation:
AA(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK; ), AB(Bartol Research Institute, University of Delaware, Newark, DE 19716; and Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK; )
Publication:
The Astrophysical Journal, Volume 623, Issue 2, pp. L129-L132. (ApJL Homepage)
Publication Date:
04/2005
Origin:
UCP
ApJ Keywords:
Stars: Blue Stragglers, Stars: Atmospheres, Stars: Rotation, Techniques: Spectroscopic
DOI:
10.1086/430271
Bibliographic Code:
2005ApJ...623L.129P

Abstract

Recent observations of blue stragglers by O. De Marco et al. have revealed continuum deficits on the blue side of the Balmer discontinuity, leading these authors to infer the presence of disks around the stars. This intriguing possibility may throw light on aspects of the mechanisms responsible for at least some of these objects; current theories of blue straggler formation invoke stellar collisions or interacting binaries, both of which appear capable of forming a circumstellar disk. However, by synthesizing photospheric spectra for models of rotating blue stragglers, we demonstrate that the Balmer jump enhancements can be wholly attributed to the influence of oblateness and gravity darkening on the formation of the continuum. Therefore, we are led to conclude that the observations of De Marco et al. can be ascribed a more prosaic explanation, that of rapid stellar rotation arising from the merger/interaction formation process.
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