Astron. Astrophys. 318, 73-80 (1997)

Acknowledgements

We are grateful to Paul Schmidtke who kindly provided original data of CAL 87. We thank Jochen Greiner, Peter Kahabka and Hans-Christoph Thomas for information and many interesting discussions and the anonymous referee for calling our attention to the paper of Callanan and Charles (1989).

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998
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