An anomalously hot and blue star found in old stellar populations that appears more massive and younger than expected. These stars lag behind normal stellar evolution, likely formed through stellar mergers or mass transfer in binary systems.
Coined by Allan Sandage in 1953, combining 'blue' for their hot color and 'straggler' meaning 'one who falls behind', because they appear to lag behind expected stellar evolution. The name reflects their puzzling presence in old star clusters.
Blue stragglers are stellar vampires that have gained new life by cannibalizing their companions! These rejuvenated stars can appear billions of years younger than their cluster mates, either by merging with another star or by stealing mass from a binary partner, giving them fresh fuel to burn hot and blue.
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