Astron. Astrophys. 355, L35-L38 (2000)

Acknowledgements

We thank the referee, J. Matthews, for his very helpful report. We also thank Dr. R. Silvotti for useful discussions. This research has made use of the Simbad database, operated by CDS, Strasbourg, France.

© European Southern Observatory (ESO) 2000

Online publication: March 21, 2000
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