Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395..632l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 395, no. 2, Aug. 20, 1992, p. 632-636. Research supported by Middlebury Col
Astronomy and Astrophysics
Astrophysics
24
H Alpha Line, Nuclear Fusion, Stellar Spectra, Supernova Remnants, Charge Coupled Devices, Light Emission, Massive Stars, Spiral Galaxies, Stellar Evolution
Scientific paper
As part of a search for the supernova remnants in M83, we have obtained new interference filter images of the site of SN 1957D and new spectra of the young SNR itself. Images were obtained in the light of H-alpha, forbidden O III, forbidden S II, and several continuum bands using the prime focus CCD camera on the CTIO 4 m telescope. An inspection of the images shows that the flux from the SNR, as observed through the forbidden O III filter, has decreased by at least a factor of five compared with observations made at Las Campanas 4 yr earlier. There is no indication of a change in the emission from the SNR in any other filter. Spectroscopic observations conducted at the position of the SN yield an forbidden O III flux of 1.8 x 10 exp -15 ergs/sq cm/s in 1991 April, down by a factor of three from measurements with the same instrument 2 yr earlier.
Blair William Patrick
Long Knox S.
Winkler Frank P.
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