Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..457m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 1, 1987, p. 457-468.
Astronomy and Astrophysics
Astronomy
13
Emission Spectra, H Alpha Line, Magellanic Clouds, Stellar Motions, Stellar Structure, Supernova Remnants, Nitrogen, Spatial Resolution
Scientific paper
Photon-counting imagery of the 16×24 pc supernova remnant, DEM 34a, has revealed a secondary lobe projecting from the bright ring of emission line filaments. Spatially resolved, long-slit echelle spectra of the Hα and [N II] emission lines show that complex motions are occurring within this remnant. Multiple lobes expanding with velocities of up to 350 km s-1 are present. The total Hα flux of DEM 34a is measured as 2.1×10-12erg s-1cm-2 (uncorrected for interstellar extinction) and the Hα/[N II] 6584+6548 Å and Hα/[S II] 6731+6716 Å brightness ratios as 3.2 and 1.1 respectively. These values are consistent with a 71 km s-1 velocity for the radiative shock which ionizes this supernova remnant.
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