CVK is a Research Assistant of the Fund for Scientific Research - Flanders. LBFMW and RHMV acknowledge financial support from a NWO `Pioneer' grant. E.P. acknowledges the support from an NWO program subsidy (grant number 783-70-000). DMH and LJA gratefull, acknowledge support under NASA's IR Laboratory astrophysics (344-02-06-01) and Long Term Space astrophysics (399-20-01) programs.
© European Southern Observatory (ESO) 2000
Online publication: June 5, 2000