NGC 6818 - the Little Gem

Reference:  The 3-D ionization structure of NGC 6818 (the Little Gem): a planetary nebula threatened by recombination

Benetti et al. - A&A 400, 161 (2003)

The fixed image at the start of the movie corresponds to the nebula as seen from Earth (North is up and East is left).
Each movie is about 150-250 Kby in size.

Rotation around the N-S axis  

• multicolor projection                                  avi          gif 
• opaque reconstruction HeII                       avi         gif
•      "              "             [OIII] (high cut)      avi         gif
•     "              "              [OIII] (low cut)      avi         gif
•     "              "              [NII] (high cut)       avi         gif
•     "              "              [NII] (low cut)       avi          gif 

Rotation around theE-W axis  

• multicolor projection                                  avi         gif
• opaque reconstruction HeII                       avi         gif
•      "              "             [OIII] (high cut)      avi         gif
•     "              "              [OIII] (low cut)      avi         gif
•     "              "              [NII] (high cut)       avi         gif
•     "              "              [NII] (low cut)       avi         gif