Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102.1217w&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, Oct. 1990, p. 1217-1223.
Astronomy and Astrophysics
Astronomy
21
Emission Spectra, H Alpha Line, Image Processing, Orion Nebula, Charge Coupled Devices, Continuous Spectra, Spectral Line Width, Star Clusters
Scientific paper
The isolation of emission-line and continuum components from narrow- and broad-band imagery is developed theoretically and then demonstrated using the Orion nebula as a test case. CCD images of M 42 taken through standard R-band and H-alpha band filters are processed according to the developed formulations. The processing results in an H-alpha emission-line image that is free of contamination by the stellar and nebular-continuum emission. A red-continuum image is also obtained, where the previously strong contamination by the H-alpha emission is eliminated. The resulting nebular H-alpha equivalent width for the 7.3 x 4.5-arcmin field of view is 5500 A, thus agreeing with expectations based on considerations of recombination-line, free-free continuum and 2-photon continuum emission from a gas at Te of about 7500 K.
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