Astron. Astrophys. 327, 890-900 (1997)

Acknowledgements

This work has been supported by the Verbundforschung of BMBF under No. 50 OR 96 016. We also like to thank Hans-Emil Schuster, Bo Reipurth and Guido and Oscar Pizarro for taking Schmidt plates for the QSO survey over many years. We are indebted to Peter Jakobsen who critically read the manuscript and helped to improve it.

© European Southern Observatory (ESO) 1997

Online publication: April 6, 1998
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