Deep narrow band interference filter photographs of selected extended planetary nebulae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Photography, Interstellar Matter, Narrowband, Optical Filters, Planetary Nebulae, Emission Spectra, H Alpha Line, Line Spectra

Scientific paper

Narrow band interference filter photographs in H-alpha, forbidden S II (6717 + 6731 A), forbidden N II (6584 A), and forbidden O III (4363 A) lines of three extended PNe are shown. The nebulae photographed this way were: Abell 13, We Sb 1 and De Ht 5. Also, the two-dimensional forbidden N II line (6584 A)/H-alpha and the forbidden S II line/H-alpha ratios of De Ht 5 and the forbidden N II line (6584 A)/H-alpha ratio of Abell 13 were obtained from these photographs.

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