Dissecting the Colour-Magnitude Diagram: A Homogeneous Catalogue of Stellar Populations in Globular Clusters

TL;DR

This paper provides a comprehensive, homogeneous catalogue of various stellar populations in 35 globular clusters, enabling detailed analysis of their distributions and relationships with cluster mass and dynamics.

Contribution

It introduces an improved, homogeneous catalogue based on ACS data, allowing for more accurate studies of stellar populations and their radial distributions in globular clusters.

Findings

Confirmed sub-linear correlation between blue straggler numbers and core mass.

Found mass segregation is not the main factor for sub-linearity.

Observed linear relationship between stellar populations and enclosed mass.

Abstract

We present a homogeneous catalogue for blue straggler, red giant branch, horizontal branch and main-sequence turn-off stars in a sample of 35 clusters taken from the ACS Survey for Globular Clusters. As a result of the superior photometry and relatively large field of view offered by the ACS data, this new catalogue is a significant improvement upon the one presented in Leigh, Sills & knigge (2007). Using our catalogue, we study and compare the radial distributions of the different stellar populations. We have confirmed our previous result (Knigge, Leigh & Sills 2009) that there is a clear, but sub-linear, correlation between the number of blue stragglers found in the cluster core and the total stellar mass contained within it. By considering a larger spatial extent than just the core, our results suggest that mass segregation is not the dominant effect contributing to the observed sub-linearity. We also investigate the radial distributions of the different stellar populations in our sample of clusters. Our results are consistent with a linear relationship between the number of stars in these populations and the total mass enclosed within the same radius. Therefore, we conclude that the cluster dynamics does not significantly affect the relative distributions of these populations in our sample.