Photoionization modelling of the Wolf-Rayet planetary nebulae IC 4663 based on multiwavelength observations

Observations of the central star planetary nebulae (CSPN) IC 4663 revealed its spectral features similar to WN sequence of massive Wolf-Rayet (WR) stars. Because CSPN IC 4663 spectrum is dominated by broad He II and N V emission lines, it is classified as [WN3] spectral type. The similarity on the central stars composition of O(He) and IC 4663 provides evidence for evolutionary sequence [WN] → O(He). Evolution of CSPN IC 4663 followed evolution low-mass star, but experienced born-again scenario when it enters white dwarf phase. So it goes back to Asymptotic Giant Branch (AGB) phase. To investigate central star properties, the nebula and its evolutionary status, we constructed the spectral energy distribution (SED) model by using photoionization code CLOUDY based on data set from optic to far-IR wavelength (∼3 – 100 μm) and include the Postdam Wolf-Rayet (PoWR) stellar model atmosphere. The comparison between the nebular abundances from photoionization model result and AGB model gives initial 3M_⊙ star with Z = 0.02. The nebula ionized mass derived from the photoionization model also consistent with the prediction from AGB model.