These are images of the planetary nebula NGC 6210 (dubbed the "Turtle Nebula") that we made from our HST WFPC2 observations in Cycle 6. The image on the right side is an enlargement of the center region of the nebula shown on the left-side frame. The color coding was changed to enhance the features of the area of interest. This was the subject of a Space Telescope Science Institute (STScI) press release by Robert Rubin and Christopher Ortiz (NASA Ames Research Center), Patrick Harrington and Nancy Jo Lame (University of Maryland), Reginald Dufour (Rice University), and NASA.
This, believe it or not, is a picture of the same nebula as the one above. This was produced by combining two HST/WFPC2 images in a different fashion. Actually this image is a ratio of two prominent emission lines: a green one from [O III] (doubly ionized oxygen) and a red line from hydrogen gas. Superimposed on the HST image are two rectangles that represent the smallest and largest aperture sizes from which we obtained data using the Infrared Space Observatory (ISO) and the short wavelength spectrometer (SWS). The rectangles, shown in the actual orientation used for our observations, are 14" X 20" and 20" X 33" respectively. The next image below shows a sample of our ISO data. The arrow head marks North and the perpendicular line East.
This is an ISO/SWS spectrum of the [Ar III] 8.99 micron line in NGC 6210. The aperture used was 14" X 20". The specific area of the nebula observed is that enclosed within the smaller rectangle shown above. The data (orange points) are fit very well by a Gaussian profile (green curve). The data processing was performed by Anna Liao using the program ISAP (ISO Spectral Analysis Package).
