Optical spectrophotometric study of supernova remnants in the Large Magellanic Cloud

Publisher Website
Google Scholar
Abstract
We present flux-calibrated spectrograms of filaments in nine bright SNRs, as well as of one H II region in the LMC. Within the observational error, we find a uniform distribution of atomic helium abundance: Z(He)= N(He)/N(H)=0.085 in all our measured sources. The average abundances of heavy elements in the SNRs of the LMC (disregarding two peculiar filaments) are: |$Z(\text{O})=1.9\times10^{-4}, Z(\text{N})=1.9\times10^{-5} \,\text{and} \,Z(\text{S})=4.1\times10^{-6}.$| The observed correlation between radii and measured electron densities naïvely interpreted suggests an average expansion rate of SNRs in the LMC that exceeds the adiabatic one. We discuss briefly the peculiar sources 0525–66 and N132DQ. An extraordinary amount of interstellar or circumstellar reddening is possibly associated with the oxygen-rich fast moving knots of N132DQ.

This publication has 0 references indexed in Scilit: