Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..267d&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 2, March 1986, p. 267-277.
Astronomy and Astrophysics
Astrophysics
45
Astronomical Spectroscopy, Supernova Remnants, Astronomical Models, Cosmic Dust, Infrared Spectra, Line Spectra, Magellanic Clouds, Optical Thickness
Scientific paper
Spectra of two galactic and three LMC SNR are presented in the 0.6 - 1.05 μ range. They reveal interesting lines of carbon, sulfur, iron, nickel, calcium, chlorine and perhaps chromium. The reddening determined from the red [S II] lines is consistent with the one derived from the Balmer decrement. In the absence of specific model predictions, empirical comparisons of line ratios are used to derive abundances. The value derived for carbon is consistent with previous determinations showing an underabundance of a factor of about 5 in LMC with respect to the Galaxy. The detection of the IR calcium triplet implies a minimum optical thickness in the emitting medium. The required column-density implies a calcium abundance only slightly below the cosmic value, therefore showing that grain destruction must have occurred. Finally, a straight application of simple atomic physics reveals a Ni/Fe ratio about 10 times above cosmic. A critical discussion of this ratio is made.
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