Astron. Astrophys. 321, 907-920 (1997)

Acknowledgements

We acknowledge useful discussions with Drs. R. Lucas and A. Natta, and we thank Dr. D. R. Crabtree for providing the V-band image of CRL 2688 and Dr. A. R. Hajian for providing the 6 cm continuum map of NGC 7027. Part of this work was written when P.C. was at the Max-Planck-Institute für Radioastronomie in Bonn (Germany). This work was supported in part by the NSF grant AST-9314408 (to P.J.H.)

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998
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