HIGH-RESOLUTION X-RAY SPECTROSCOPY OF THE SUPERNOVA REMNANT N132D

We present a joint nonequilibrium ionization analysis of spectral data from the Einstein Observatory of the supernova remnant N132D in the L arge Magellanic Cloud. We use high spectral resolution data from the F ocal Plane Crystal Spectrometer (FPCS) and the Solid State Spectromete r (SSS), and lower spectral resolution data from the Imaging Proportio nal Counter (IPC) and Monitor Proportional Counter (MPC). Our updated analysis uses new calibrations for the FPCS and SSS efficiencies and a single-temperature, single-ionization time-scale model for the plasma . The FPCS detected individual emission lines of O VII, O VIII, Ne IX, Ne X, Fe XVII, and possibly Fe XX. Measured line widths for the oxyge n lines suggest Doppler broadening that is roughly consistent with opt ically measured expansion velocities of 2250 km s-1. Constraints on te mperature and ionization age from measured FPCS line flux ratios are c onsistent with results of spectral fits to the SSS and IPC data, which give a temperature of 8.4 (+0.8; -0.6) x 10(6) K and an ionization ag e of 6.1 (+5.0; -2.6) x 10(3) cm-3 yr. At the SSS/IPC temperature, FPC S flux ratios constrain the O/Fe abundance to be at least 1.9 times it s solar value and the O/Ne abundance to be 0.2-1.0 times its solar val ue. The SSS/IPC fits provide constraints of 1.0-4.0 times solar for O/ Fe and 0.5-1.5 times solar for O/Ne which are consistent with the FPCS results. We are puzzled to find that the SSS/IPC fits indicate abunda nces of oxygen and other heavy elements relative to the light elements that are below both their solar values and their mean values for the LMC. We therefore compare abundance ratios to calculations for the com position of ejecta from Type II supernovae including a contribution fr om swept-up interstellar material with elemental abundances appropriat e for the LMC. Models for remnants with progenitor masses of 20 and 25 M. are completely consistent with the data, while remnants With proge nitor masses of 13 and 15 M. can be made consistent if the progenitors are required to eject a large fraction of their iron cores.