Towards an explanation of the causes of the rarity of two Tasmanian Spyridium species

Dielectronic recombination data for the beryllium isoelectronic sequence has been calculated as part of the assembly of a dielectronic recombination database necessary for modelling of dynamic finite-density plasmas (Badnell et al. 2003, A&A, 406, 1151). Dielectronic recombination coefficients for a selection of ions from this sequence are presented and the results discussed.