Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...88..245r&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 88, no. 2, May 1991, p. 245-254.
Astronomy and Astrophysics
Astrophysics
4
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.
Moreno Miguel A.
Rosado Margarita
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