Astron. Astrophys. 347, 478-493 (1999)

Acknowledgements

We would like to thank the efforts of the VILSPA and GSFC IUE staffs, that have provided the scientific community with a precious database, for this and for a great deal of many other astrophysical objects, which will have a fundamental impact in any study in the coming years. R.V. is grateful to Dr. Willem Wamsteker for hospitality at the IUE Observatory of ESA at Villafranca del Castillo (VILSPA). J.G. is supported by the German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie (BMBF/DLR) under contract No. FKZ 50 QQ 9602 3. R.V. was partially supported by the Italian Space Agency under contract ASI 94-RS-59. In this research we have used, and acknowledge with thanks, data from the AAVSO International Database, based on observations submitted to the AAVSO by variable star observers worldwide. Thanks are also due to R. Luthardt, F. Montagni, M. Maesano, N. Tomov and M. Tomova for informing us about the visual behaviour of AG Dra during the last active phase, and for providing us with their photometric observations. We are grateful to M. Friedjung for stimulating discussions and comments which have greatly improved this paper.

© European Southern Observatory (ESO) 1999

Online publication: June 30, 1999
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