Discovery of a large, high-excitation planetary nebula at L = 136 deg, B = +5 deg

Details Discovery of a large, high-excitation planetary nebula at L = 136 deg, B = +5 deg Discovery of a large, high-excitation planetary nebula at L = 136 deg, B = +5 deg

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114..414h&link_type=abstract

Astronomy and Astrophysics, vol. 114, no. 2, Oct. 1982, p. 414-418.

Astronomy and Astrophysics

Astrophysics

17

Astronomical Spectroscopy, Forbidden Transitions, Oxygen Spectra, Planetary Nebulae, Spectrophotometry, Electron Density (Concentration), Emission Spectra, Line Spectra, Photographic Plates

Scientific paper

The discovered asymmetric nebulosity is bright in forbidden line O III emission. On the basis of the spectrophotometry and deep forbidden line O III images presented, it is concluded that the considered object is a very large, old, high excitation planetary nebula. The nebula was discovered on the forbidden line O III plate of the emission-line survey of the galactic plane by Parker et. al. (1979). Follow-up, high-angular resolution forbidden line O III images of this nebula were obtained in October 1981. The new nebula is found to have an outer ring and an inner region which is asymmetric in appearance. Based on its H-beta surface brightness, a distance estimate of 350-400 pc is adopted.

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