Blue straggler formation at core collapse
Sambaran Banerjee

TL;DR
This study uses N-body simulations to investigate how core collapse in star clusters triggers the formation of blue straggler stars, revealing multiple formation episodes and the roles of collisions and binaries.
Contribution
It demonstrates that core collapse induces bursts of blue straggler formation, combining collisional and binary pathways, in simulated star clusters.
Findings
Blue stragglers form in bursts at core collapse onset
Multiple BSS formation episodes occur during post-core-collapse
Both collisional and binary BSSs are produced after core collapse
Abstract
Among the most striking feature of blue straggler stars (BSS) is the presence of multiple sequences of BSSs in the colour-magnitude diagrams (CMDs) of several globular clusters. It is often envisaged that such a multiple BSS sequence would arise due a recent core collapse of the host cluster, triggering a number of stellar collisions and binary mass transfers simultaneously over a brief episode of time. Here we examine this scenario using direct N-body computations of moderately massive star clusters (of order 10^4 Msun ). As a preliminary attempt, these models are initiated with approx. 8-10 Gyr old stellar population and King profiles of high concentrations, being "tuned" to undergo core collapse quickly. BSSs are indeed found to form in a "burst" at the onset of the core collapse and several of such BS-bursts occur during the post-core-collapse phase. In those models that include a…
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Taxonomy
TopicsMineral Processing and Grinding · Hydrocarbon exploration and reservoir analysis · Seismic Imaging and Inversion Techniques
