Spectrophotometric observations of a peculiar nitrogen-rich planetary nebula NGC 2440

Details Spectrophotometric observations of a peculiar nitrogen-rich planetary nebula NGC 2440 Spectrophotometric observations of a peculiar nitrogen-rich planetary nebula NGC 2440

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982japa....3..145l&link_type=abstract

Journal of Astrophysics and Astronomy, vol. 3, June 1982, p. 145-150.

Astronomy and Astrophysics

Astrophysics

2

Astronomical Photometry, Emission Spectra, Nitrogen, Planetary Nebulae, Spectrophotometers, Abundance, Forbidden Bands, H Alpha Line, Sulfur

Scientific paper

By using the Boller and Chivens spectrograph with a moderate dispersion (59 A/mm) in the red spectral region, 65 spectra covering the whole surface of the planetary nebula NGC 2440 were obtained. Intensities of H-alpha, forbidden N II lines 6548-6584 A and forbidden S II lines 6717-6731 A are derived using the IDS system available at the ESO in La Silla (Chile). The nebula is known to be a nitrogen-rich nebula (Peimbert, 1978) surrounded by secondary structures (Minkowski, 1964). The unusual high value of the forbidden N II lines/H-alpha in the central core (approximately 3.0) is certainly due to the nitrogen overabundance occurring in that part of the nebula. Its variations from the center to the outer regions are interpreted as a consequence of small-scale ionization structure (Capriotti, Cromwell and Williams, 1971). The observations show clearly an outward increase of both forbidden N II lines/H-alpha and I(6717)/I(6713) ratios.

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