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The physics governing the formation of star clusters is still not entirelyunderstood. One open question concerns the amount of angular momentum thatnewly formed clusters possess after emerging from their parent gas clouds.Recent results suggest an alignment of stellar spins and binary orbital spinsin star clusters, which support a scenario in which clusters are born with netangular momentum cascading down to stellar scales. In this paper, we combineGaia data and published line of sight velocities to explore if NGC6791 andNGC6819, two of the clusters for which an alignment of stellar spins has beenreported, rotate in the same plane as their stars. We find evidence forrotation in NGC6791 using both proper motions and line of sight velocities. Ourestimate of the inclination angle is broadly consistent with the meaninclination that has been determined for its stars, but the uncertainties arestill substantial. Our results identify NGC6791 as a promising follow-upcandidate to investigate the link between cluster and stellar rotation. We findno evidence for rotation in NGC6819.

Linking the rotation of a cluster to the spins of its stars: The kinematics of NGC6791 and NGC6819 in 3D