Hi Colin,
If you are interested in following up, you might want to check if this star is in the Gaia DR2 data set :-
https://www.cosmos.esa.int/web/gaia/dr2
If so, there might even be proper motion data for it.
This paper, "Gaia unveils the kinematics of multiple stellar populations in 47 Tucanae" by Milone et. al. July 2018, may be of interest :-
https://arxiv.org/pdf/1807.03511.pdf
Quote:
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Originally Posted by Milone et. al.
ABSTRACT
The series of events, which occurred at high redshift and originated multiple stellar populations in Globular Clusters (GCs) are still poorly understood.
Theoretical work suggests that the present-day dynamics of stars in nearby GCs, including the rotation and velocity dispersion, may retain important clues on the formation of multiple populations.
So far, the dynamics of multiple populations have been investigated either from radial
velocities of a relatively-small sample of stars, or from relative proper motions of stars in the
small field of view provided by the Hubble Space Telescope. In this context, Gaia provides
the unique opportunity to investigate the dynamics of thousands GC stars over a wide field of
view.
For the first time, we combine Gaia DR2 proper motions and multi-band photometry to
study the internal motions of the two main stellar populations of 47 Tucanae in a wide field of
view. We confirm that this cluster exhibits high rotation on the plane of the sky and find that
both stellar generations share similar rotation patters. Second-generation stars show stronger
anisotropies and smaller tangential-velocity dispersion than the first generation, while there
is no significant difference between their radial-velocity dispersion profiles. We discuss the
impact of these results in the context of the formation scenarios for multiple stellar populations
in GCs.
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"HST PROPER MOTIONS AND STELLAR DYNAMICS IN THE CORE OF THE GLOBULAR CLUSTER 47 TUCANAE" by . MCLAUGHLIN et. al. Sept 2006, may
also be of interest :-
https://arxiv.org/pdf/astro-ph/0607597.pdf