Alternative Lifestyles in Old Open Star Clusters: At the Interface of Stellar Evolution and Stellar Dynamics

Speaker: 
Robert Mathieu (U Wisc-Madison)
Event Date and Time: 
Mon, 2015-02-23 15:30 - 16:30
Location: 
Hennings 318

Nearly one quarter of all stars in old open star clusters do not follow classical single-star evolution paths. These non-standard evolutionary paths are closely associated with the large binary-star populations in these clusters. I will present an array of ground- and space-based observations that securely show that most blue stragglers - a subset of the population - are formed through mass transfer. The others are likely formed through mergers and collisions, although the observational evidence is less comprehensive.

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