Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.2055h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 90, Oct. 1985, p. 2055-2060.
Astronomy and Astrophysics
Astronomy
7
Astronomical Photography, Planetary Nebulae, Charge Coupled Devices, Electron Density (Concentration), High Resolution, Imaging Techniques, Spatial Resolution
Scientific paper
The use of a rather large equivalent focal length in an attempt to obtain two-dimensional monochromatic images of the planetary nebula IC 2165, catalogued as a small, high-excitation object of 8 arcsec diameter, with a very faint and very hot central star, is reported. Due to the high spatial resolution of 0.047 arcsec/pixel and the seeing of 0.8 arcsec, detailed structures less than 1 arcsec could be distinguished. The nebula exhibits a more or less homogeneous spheroidal H-alpha image, while the forbidden N II isophote map displays four symmetrical condensations well separated in two lobes. It is concluded that the relative enhancement of forbidden N II in the peripheral zones could be explained by an abundance effect together with the strong collisional excitation due to the high electron density.
Grundseth Bernt
Hua Chon-Trung
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