Editing Blue straggler (section)

{{Short description|A main sequence star that is more luminous and bluer than expected}}
[[File:Blue Straggler HRD globular cluster.svg|thumb|upright=1.2|Sketch of [[Hertzsprung–Russell diagram]] of a globular cluster, showing blue stragglers]]
A '''blue straggler''' is a type of [[star]] that is more [[luminosity|luminous]] and [[stellar classification|bluer]] than expected.  Typically identified in a [[stellar cluster]], they have a higher [[effective temperature]] than the [[main sequence turnoff]] point for the cluster, where ordinary stars begin to evolve towards the [[red giant branch]]. Blue stragglers were first discovered by [[Allan Sandage]] in 1953 while performing [[photometry (astronomy)|photometry]] of the stars in the globular cluster [[Messier 3|M3]].<ref name="discovery">{{cite journal | author = Sandage, Allan | title = The color-magnitude diagram for the globular cluster M3 | journal = [[The Astronomical Journal]] | volume = 58 | pages = 61–75 | year = 1953 | bibcode = 1953AJ.....58...61S | doi = 10.1086/106822}}</ref><ref>{{cite news | url = https://www.nytimes.com/1991/08/27/science/cannibal-stars-find-a-fountain-of-youth.html | title = Cannibal Stars Find a Fountain of Youth | date = 1991-08-27 | access-date = 2010-01-18 | author = John Noble Wilford | work=The New York Times}}</ref>