Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..131f&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 1, 1981, p. 131-137.
Astronomy and Astrophysics
Astronomy
19
Emission Spectra, H Alpha Line, Planetary Nebulae, Supernova Remnants, Forbidden Bands, H Ii Regions, Nonthermal Radiation, Oxygen Ions, Radio Sources (Astronomy), Sky Surveys (Astronomy), Spectrophotometry
Scientific paper
Spectrophotometry is presented for the large and very faint emission nebula known as Sharpless 216. Although classified as an H II region, the present observations show it has stronger forbidden lines of S II 6717, 6731 A, and N II 6583, 6548 A relative to H-alpha than are seen in the spectra of H II regions. While the spectrum of S216 is similar to that observed for supernova remnants, the nebula does not show any filamentary structure on either direct narrow passband imagery or on the Palomar Sky Survey, and it is not coincident with any known extended nonthermal radio source. S216's spectral properties are also similar to those of a few peculiar planetary nebula, and it does exhibit a pronounced ionization structure in which the O III forbidden-line emission is stronger toward the interior. The possibility that this object is an H II region, a planetary nebula, or a supernova remnant is discussed.
Blair William Patrick
Fesen Robert A.
Gull Ted R.
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