Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..135k&link_type=abstract
Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 135-142. Research supported by the Alfred P. Sloan Foundation
Astronomy and Astrophysics
Astrophysics
48
Astronomical Spectroscopy, Intergalactic Media, Nebulae, Supernova Remnants, Abundance, Emission Spectra, H Ii Regions, Oxygen Spectra, Spectral Line Width, Spectrophotometry
Scientific paper
Spectrophotometry of an unusual emission region in the irregular galaxy NGC 4449 is presented that confirms that it is a supernova remnant (SNR) similar to Cas A, and a simple overall picture of the interaction between the SNR and the H II region in which it is embedded is described. Broad forbidden emission lines of O I at 6300 and 6363 A, of O II at 7320 and 7330 A, and of O III at 4959 and 5007 A are found, and the following are inferred: an expansion at 3500 km/s, electron temperature of about 40,000 K where oxygen is doubly ionized, a density exceeding 100,000/cu cm in the region where oxygen is once ionized, and about 0.1 solar masses of oxygen present in the gas that is presently cooling. In addition, the absence of hydrogen in fast-moving, oxygen-rich knots suggests that nucleosynthesis has been important in the star that created this remnant.
Blair William Patrick
Kirshner Robert P.
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