The Unimodal Distribution Of Blue Straggler Stars in M75 (NGC 6864)
R. Contreras Ramos, F. R. Ferraro, E. Dalessandro, B. Lanzoni, R., T. Rood

TL;DR
This study maps the distribution of blue straggler stars in M75, revealing a unimodal distribution concentrated in the core, with implications for stellar dynamics and binary star evolution in globular clusters.
Contribution
First detailed star counts and density profile of M75, analyzing the radial distribution of BSSs and their concentration in the core, highlighting differences from other clusters.
Findings
BSSs are highly concentrated in the core of M75.
No upturn in BSS frequency observed in the outskirts.
BSS distribution decreases rapidly with radius, similar to M79.
Abstract
We have used a combination of multiband high-resolution and wide-field ground-based observations to image the Galactic globular cluster M75 (NGC 6864). The extensive photometric sample covers the entire cluster extension, from the very central regions out to the tidal radius, allowing us to determine the center of gravity and to construct the most extended star density profile ever published for this cluster. We also present the first detailed star counts in the very inner regions. The star density profile is well re-produced by a standard King model with core radius r_c ~ 5.4" and intermediate-high concentration c ~ 1.75. The present paper presents a detailed study of the BSS population and its radial distribution. A total number of 62 bright BSSs (with m_F255W < 21, corresponding to m_F555W < 20) has been identified, and they have been found to be highly segregated in the cluster…
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