The astrometric accuracy of "Carte DU Ciel" plates and proper motions in the field of the open cluster NGC 1647.

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astrometry, Stars: Individual: Sz Tau, Galaxy: Open Clusters: Individual: Ngc 1647

Scientific paper

The astrometric accuracy of triple image Carte du Ciel plates has been analysed using plates of the open cluster NGC 1647. A new multithreshold technique was used for the treatment of the triple image plates. Accuracies ranging from 100 mas to 200 mas were found. We determined proper motions with a median accuracy of 1.6 mas/a for 2220 stars in the field of NGC 1647. The membership probabilities of stars in the cluster region agree very well with the data of Francic (1989). Due to a significant difference of the proper motions of SZ Tau and the cluster members, SZ Tau seems not to be a member of NGC 1647.

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