Astron. Astrophys. 357, 1157-1169 (2000)

Acknowledgements

We are grateful to the referee for very useful critical remarks. Two of the authors (KPL and DGY) acknowledge hospitality of N. Copernicus Astronomical Center in Warsaw. This work was supported in part by the RBRF (grant No. 99-02-18099), INTAS (grant No. 96-0542), and KBN (grant 2 P03D 014 13).

© European Southern Observatory (ESO) 2000

Online publication: June 5, 2000
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