Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114..205l&link_type=abstract
Astronomy and Astrophysics, vol. 114, no. 1, Oct. 1982, p. 205-207.
Astronomy and Astrophysics
Astrophysics
6
Astronomical Photography, Astronomical Spectroscopy, Line Spectra, Planetary Nebulae, Stellar Structure, H Alpha Line, Nitrogen, Spectrophotometry
Scientific paper
Results of long exposure plates, made at the Haute Provence Observatory, France, are presented for nine selected nebulae, using a large bandwidth interference filter coupled with an ITT image tube. Spectrophotometric observations have been made for one nebula, IC 418, and the contour map of the (N II)/H-alpha ratio is derived. It is found that this ratio increases toward the outer extended envelope of the nebula. Results show that one of the typical features of secondary structures is the enhancement of the N II line with respect to H-alpha. In addition, filamentary structures appear sharper in N II than in H-alpha, as shown for example in NGC 650-1. It is concluded that direct photography with long exposure time and modern spectrophotometry are complementary methods for detecting and studying secondary structures in planetary nebulae.
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