Abstract
The authors present optical and UV spectra of the planetary nebula LM1-64 in the LMC. This is a high excitation planetary nebula which shows evidence of having a WC central star. Broad and complex stellar emission at λ4650 (due to C III and C IV) is detected in the optical spectrum. The authors have measured all the emission line fluxes available and determined the physical parameters and chemical composition of the ionized gas. The derived values are T(O III) = 14000 K, log He/H = 11.05±0.05, log C/H = 8.83±0.15, log N/H = 8.03±0.20, log O/H = 8.31±0.10, log Ne/H = 7.75±0.10 and log Ar/H = 5.25±0.20. LM1-64 shows a strong C enhancement in the envelope as result of the central star activity, while He, O and Ne are comparable to the average values reported for the LMC-PNe. From ionization structure models the authors have estimated the effective temperature of the central star to be ≈100,000 K and log g ≈ 5.0. This temperature is much higher than the values reported for the known LMC-PNe with WR nucleus. The visual apparent magnitude of the object is 20.2±0.50.
