blue straggler star

blue straggler star

[¦blü ′strag·lər ‚stär]
(astronomy)
A member of a star cluster that lies above the turnoff point of the cluster's Hertzsprung-Russell diagram, and lies near the main sequence.
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References in periodicals archive ?
A team of astronomers used Hubble to study the blue straggler star content in Messier 30, which formed 13 billion years ago and was discovered in 1764 by Charles Messier.
To better understand cluster ageing, the team mapped the location of blue straggler stars in 21 globular clusters, as seen in images from Hubble and the MPG/ESO 2.
Blue Straggler Stars "A puzzling feature of many globular clusters is the presence in them of an appreciable number of fairly hot stars, in apparent defiance of the modern theory of stellar evolution.