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We analyze spectroscopic and photometric data to determine the projectedinclinations of stars in three open clusters: the Pleiades, Praesepe, and M35.We determine the $\sin i$ values of 42, 35, and 67 stars in each cluster,respectively, and from their distributions we find that isotropic spins andmoderate alignment are both consistent with the Pleiades and Praesepe data.While it is difficult to distinguish between these scenarios for a singlecluster, an ensemble of such distributions may facilitate a distinction. TheM35 inclination distribution is most consistent with a superposition ofisotropic and anisotropic spins, the source of which could be systematic erroror a physical grouping of aligned stars. We also study internal clusterkinematics using radial velocities and proper motions. Our kinematics analysisreveals significant plane-of-sky rotation in Praesepe, with a mean velocity of$0.132 \pm 0.022$ km s$^{-1}$ in a clockwise direction.

Stellar Spins in the Pleiades, Praesepe, and M35 Open Clusters