Abell 39

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Click HERE to see a "smoother" version.
Abell 39 is perhaps one of the most perfect examples of a spherical planetary nebula in the galaxy. As expected, a sphere of gas will show a brighter limb ("edge") since that line of sight has more gas than the view through the center (two layers) of the bubble. This one is unfortunately very faint and subtle details of the bubble require a larger telescope (or very long exposures) to bring out. Abell 39 is approximately 5 light years across and 7,000 light years away. Note the myriad of background galaxies in the image- especially through the transparent sphere of gas. Also note that the central star is distinctly blue-white in color. A blue-white color indicates that the central star (white dwarf) is very hot. It emits copius amounts of UV radiation which excite the surrounding gas and make it flouresce its blue color. Compare this image with another image of Abell 39 taken at the 3.5m WIYN telescope.

Equipment

Meade 16in LX200 telescope operating at f/6.3
SBIG ST8E CCD camera with color filter wheel

L R G B color production was used to create this image.

Luminance = 96 minutes binned 1x1
 Red = 30 minutes binned 3x3
 Green = 30 minutes binned 3x3
 Blue = 60 minutes binned 3x3

Minimum credit line: Kris and Derek Peterson/Adam Block/NOAO/AURA/NSF

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Updated: 5/20/2000