A backyard amateur astrophotographer enjoying retirement with my wife on beautiful Lake Livingston in Onalaska, Texas, about 90 minutes north of Houston.
(read more)Ansae, or "handles", sometimes appear on each side of the progenitor star of a PN. Scientists have found that these ansae are expanding faster than the nebula shell itself. They have been nicknamed FLIERs, or Fast Low Ionization Emission Regions. They are tiny and are much easier to see on Hubble images. These ansae are often found in PN which have fast rotating binary central star systems. I find it interesting that all of the PNe below are OIII-dominated nebulae.
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