Photoionisation modelling of nova LMC 1990 #1

Nova LMC 1990A was a very fast Ne-O-Mg nova, for which a particularly dense coverage of spectral observation in both the UV and optical was obtained. The data for the nebular phase were subjected to an analysis by the photoionisation modelling code MAPPINGS 2. The following parameters were obtained: Lmax = 8×104L⊙, Teff = 2×105K and the mass of ejecta = 5.5×10−5M⊙. The abundance ratios in the ejecta were similar to those obtained by Williams et al. (1985) in the case of V693 CrA 1981. The N/O ratio and the overabundance of Al is consistent with outburst on a ONeMg white dwarf of mass ∽1.2M⊙, but the super-Eddington luminosity, and amount of mass ejected presents some problems to theory.