Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..118..277g&link_type=abstract
Astronomy and Astrophysics Supplement, v.118, p.277-282
Astronomy and Astrophysics
Astrophysics
18
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.
Bonnefond Pascal
Geffert Michael
Guibert Jean
Maintz Gisela
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