![]() | ![]() |
Astron. Astrophys. 329, 735-746 (1998) AcknowledgementsWe thank Oystein Lie-Svendsen and Viggo H. Hansteen for comments on an earlier version of the manuscript. This work was supported by the Norwegian Research Council (NFR) under contracts 107781/432 and 115831/431 and by NASA grant W-18.786. ![]() ![]() ![]() ![]() © European Southern Observatory (ESO) 1998 Online publication: December 8, 1997 ![]() |