Evidence for C and Mg variations in the GD-1 stellar stream

Understand

Dynamically cold stellar streams are the relics left over from globular cluster dissolution.

• These relics offer a unique insight into a now fully disrupted population of ancient clusters in our Galaxy.
• Using a combination of Gaia eDR3 proper motions, optical and near-UV colours we select a sample of likely Red Giant Branch stars from the GD-1 stream for medium-low resolution spectroscopic follow-up.
• Based on radial velocity and metallicity, we are able to find 14 new members of GD-1, 5 of which are associated with the \emph{spur} and \emph{blob/cocoon} off-stream features.