Blue Straggler Stars: The Spectacular Population in M80

Details Blue Straggler Stars: The Spectacular Population in M80 Blue Straggler Stars: The Spectacular Population in M80

1999-04-15

arxiv.org/abs/astro-ph/9904196v1

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, Astrophysical Journal Letters, in press

Scientific paper

10.1086/307700

Using HST-WFPC2 observations in two ultraviolet (UV) filters (F225W and F336W) of the central region of the high density Galactic Globular cluster (GGC) M80 we have identified 305 Blue Straggler Stars (BSS) which represents the largest and most concentrated population of BSS ever observed in a GGC. We also identify the largest, clean sample of evolved BSS yet found. The high stellar density alone cannot explain the BSS, and we suggest that in M80 we are witnessing a transient dynamical state, during which stellar interactions are delaying the core-collapse process leading to an exceptionally large population of collisional-BSS.

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