1-D Dusty Photo-ionization Models of WR Planetary Nebulae NGC 2452 and IC 2003

Abstract We report dusty photo-ionization models for two Planetary Nebulae NGC 2452 and IC 2003, which have [WR] type central stars, using photo-ionization code Cloudy17. We used the medium resolution optical spectra and archival IRAS photometry to constrain our models. Further, the physical size of the ionized nebula derived using better known distance value from the literature and absolute Hβ flux were used as additional constrain. We examine the importance of photo-electric heating of the ionized gas by grains in these PNe: model which does not consider photo-electric heating fits the data better for NGC 2452 whereas in the case of IC 2003 the dust heating model fits better. We derive the elemental abundances of these PNe using the empirical method as well as through photo-ionization models. We obtain the values of N/O ratio for both PNe from dusty photo-ionization models which are lower than their respective values arrived using empirical methods. The central stars are assumed to be blackbodies and the photospheric temperatures derived respectively for NGC 2452 and IC 2003 from their best fit models are 182kK and 155kK and their respective luminosities are 630L⊙ and 1015L⊙. We propose that both the PNe were resulted from a lower mass progenitor of mass less than 2.8M⊙.