Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sscr.conf..475b&link_type=abstract
In: Supernovae: A survey of current research; Proceedings of the Advanced Study Institute, Cambridge, England, June 29-July 10,
Astronomy and Astrophysics
Astronomy
Andromeda Galaxy, Astronomical Models, H Alpha Line, Stellar Spectrophotometry, Supernova Remnants, Abundance, Astronomical Photography, Emission Spectra, Forbidden Bands, H Ii Regions, Spectrum Analysis, Spiral Galaxies
Scientific paper
Nebulosities believed to be SNRs in M31 have been identified by means of H-alpha + forbidden line N II and forbidden line S II interference filter photography. Using the measured diameter, as well as an estimate of the pressure in the optical filaments, an initial energy is calculated for each remnant which appears to be correlated to remnant diameter. This effect may be due to filament magnetic pressure. The spectra are also used in conjunction with shock model calculations to study abundance gradients in M31. A comparison of these results with abundance gradients obtained from H II regions allows the accuracy of the two methods to be appraised. It is found that N and O abundance gradients are comparable to those seen in order intermediate-to-late-type spiral galaxies.
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