Archived from: http://www.noao.edu/jacoby/abell_78.html
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Abell 78
This planetary nebula has the unusual property of having a faint outer halo
composed of normal stellar material (mostly hydrogen) and a bright inner
elliptical ring composed mostly of helium. The helium ring provides direct
confirmation that hydrogen is being converted to helium in the centers of
stars and can later be ejected back into the galaxy's pool of gas for
building another generation of enriched stars.
Shape: bright central zones and faint extended outer halo.
Distance: 5,500 ly
Location: Cygnus constellation
RA: 00 40 33.00 DEC: +26 44 30.0
Size: 1.8 arc min (about 2.7 ly)
Abundances/Description: The outer halo is composed mostly of Hydrogen.
The bright inner elliptical ring is composed mostly of Helium.
Discoverer: George Abell - (1966)
Author: George Jacoby
Planetary Nebula Sampler
Curator:
Hartmut Frommert
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