Characterizing and correcting the proper motion bias of the bright Gaia EDR3 sources

@article{CantatGaudin2021CharacterizingAC,
  title={Characterizing and correcting the proper motion bias of the bright Gaia EDR3 sources},
  author={Tristan Cantat-Gaudin and Timothy D. Brandt},
  journal={Astronomy \& Astrophysics},
  year={2021}
}
In this paper, we characterize magnitude-dependent systematics in the proper motions of the Gaia EDR3 catalog and provide a prescription for their removal. The reference frame of bright stars (G ≲ 13) in EDR3 is known to rotate with respect to extragalactic objects, but this rotation has proven difficult to characterize and correct. We employ a sample of binary stars and a sample of open cluster members to characterize this proper motion bias as a magnitude-dependent spin of the reference frame… 

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