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Astron. Astrophys. 348, 1020-1034 (1999)

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We greatly appreciate the support by Dr. H. Ungerechts, IRAM Granada, and by D. Ashby and J. Glenn, Steward Observatory, who carried out some of these observations. We acknowledge the help of Dr. P. Rocher of the Bureau des Longitude, Paris for preparing the ephemerides for the PdBI, using the latest sets of orbital elements of Dr. D.K. Yeomans of JPL, Pasadena. We acknowledge helpful advice by Dr. E. Krügel, Bonn, and we are very grateful to Dr. D. Bockelée-Morvan, Paris, for providing molecular line frequencies for editing the continuum data and we thank her and her colleagues for the efficient collaboration at the Plateau de Bure during the shared line and continuum observations. JHB thanks Dr. Casey Lisse for helpful discussion.

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© European Southern Observatory (ESO) 1999

Online publication: August 13, 199