2018MNRAS.473..355T

We present modelling and analysis of the ejecta of nova V723 Cas based on spatially resolved infrared spectroscopic data from Keck-OSIRIS, with LGSAO (adaptive optics module). The 3D photoionization models include the shell geometry taken from the observations and an anisotropic radiation field, composed by a spherical central source and an accretion disc. Our simulations indicate revised abundances log(N_Al/N_H) = -5.4, log(N_Ca/N_H) = -6.4 and log(N_Si/N_H) = -4.7 in the shell. The total ejected mass was found as M_shell = 1.1 x 10^–5 M_☉ and the central source temperature and luminosity are T = 280 000 K and L = 10³⁸ erg s^–1. The 3D models are compared to basic 1D simulations to demonstrate the importance of using more realistic treatments, stressing the differences in the shell mass, abundances and characterization of the central source. The possibility of V723 Cas being a neon nova and the puzzling central source features found are discussed.