Improved proper motion determinations for 15 open clusters based on the   UCAC4 catalog
  The proper motions of 15 nearby (d < 1 kpc) open clusters were recalculated using data from the UCAC4 catalog. Only evolved or main sequence stars inside a certain radius from the center of the cluster were used. The results differ significantly from the ones presented by Dias et al. (2014). This could be explained by the different approach to taking the field star contamination into account. The present work aims to emphasize the importance of applying photometric criteria for the calculation of open cluster proper motions. 
Alexander Kurtenkov, Nadezhda Dimitrova, Alexander Atanasov, Teodor D.   Aleksiev
astro-ph.SR astro-ph.GA