Monochromatic observations of planetary nebulae

Details Monochromatic observations of planetary nebulae Monochromatic observations of planetary nebulae

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.105..139l&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 105, no. 1, Oct. 1984, p. 139-150.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Photography, Astronomical Spectroscopy, Planetary Nebulae, H Alpha Line, H Beta Line, Image Filters, Monochromatic Radiation, Nitrogen, Oxygen Spectra

Scientific paper

Monochromatic images of planetary nebulae, including three faint objects from the catalog of Abell (1966), obtained using interference filters with 5-10-A or 50-A bandwidths on the 1.2-m and 1.93-m telescopes at the Observatoire de Haute Provence and the 1.52-m telescope at ESO are presented and characterized. The filters are centered at H-alpha, H-beta, and the forbidden lines of N II (6584 A), S II (6717 A), and O III (5007 A); photographic plates, image tubes, and an image photon-counting device are employed. For objects with large N II/H-alpha intensity ratios (such as A79), the large contribution of the forbidden N II line to the photored flux is found to require a 30-percent reduction in previously calculated distance estimates.

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