Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...112..124c&link_type=abstract
Astronomy and Astrophysics, vol. 112, no. 1, Aug. 1982, p. 124-132. Research supported by the Natural Sciences and Engineering
Astronomy and Astrophysics
Astrophysics
10
Astronomical Spectroscopy, Infrared Spectra, Interstellar Extinction, Near Infrared Radiation, Planetary Nebulae, Abundance, Astronomical Maps, Electron Energy, H Alpha Line, H Beta Line, Lyman Spectra, Optical Thickness, Sulfur
Scientific paper
One and two dimensional data of the planetary nebula NGC 2440 are presented. From spectra obtained with the ESO Reticon System, relative line intensities have been obtained in the spectral region 6300-10,000 A. The derived total abundance of sulfur is lower than the value in the sun and in the Orion Nebula. Present available data support the idea that NGC 2440 is optically thin in the Lyman continuum. The nebula was also mapped with a JPL CCD camera through interference filters which isolated H-beta, H-alpha, forbidden N II 6584, and forbidden S III 9532 A lines. The forbidden N II/H-alpha ratio increases steadily outward, while the H-alpha/H-beta shows a smooth appearance, having almost no correlation with the hydrogen intensity maps. This fact is interpreted as an evidence that the extinction toward NGC 2440 is mainly interstellar.
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