Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..365d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Sept. 15, 1985, p. 365-384.
Astronomy and Astrophysics
Astronomy
35
Abundance, Magellanic Clouds, Spectrophotometry, Supernova Remnants, Astronomical Spectroscopy, Electron Density (Concentration), H Ii Regions
Scientific paper
The authors 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, they find a uniform distribution of atomic helium abundance: Z(He) = N(He)/N(H) = 0.085 in all measured sources. The average abundances of heavy elements in the SNRs of the LMC (disregarding two peculiar filaments) are: Z(O) = 1.9×10-4, Z(N) = 1.9×10-5 and Z(S) = 4.1×10-6. 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. The authors 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.
Danziger Ivan John
Leibowitz Elia M.
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