...fields

Based on observations acquired at the Mount Palomar and Las Campanas Observatories as well as at the European Southern Observatory. Also based on Schmidt-plate digitisations performed with the MAMA measuring machine of C.A.I. (I.N.S.U., Paris).

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...Gosset

Chercheur Qualifié au Fonds National de la Recherche Scientifique (Belgium).

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...Surdej

Presently member of the Astrophysics Division, Space Science Department of the European Space Agency and also Directeur de Recherches au Fonds National de la Recherche Scientifique (Belgium).

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...motion

Although gravitational lensing could in some cases mimic small proper-motion effects.

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