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Astron. Astrophys. 362, 1122-1126 (2000) AcknowledgementsWe wish to thank Pierre Valiron for helpful discussions and Pascale Ehrenfreund, Max Bernstein and Emma Bakes for making us aware of their work on the subject and sharing ideas; S. Chakrabarti for clarifying us their computations. We finally thank our referee, F. Combes, for her fast and useful comments on the manuscript.
© European Southern Observatory (ESO) 2000 Online publication: October 30, 2000 ![]() |