Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21360404v&link_type=abstract
American Astronomical Society, AAS Meeting #213, #604.04
Mathematics
Logic
Scientific paper
Planetary nebulae come in a variety of shapes, sizes and colors, making them some of the most beautiful objects seen in our universe. In order to understand the physical processes responsible for the different developments of planetary nebulae, we must first successfully provide a classification for their shapes and structures, a morphological classification. This classification scheme will be based on one previously developed for pre-planetary nebulae. About 80 young planetary nebulae were studied using high-resolution images taken with the Hubble Space Telescope. The criteria used for classifying these planetary nebulae range from their overall structure, to smaller structures and properties within the objects. It was found that most of the morphological classification criteria for pre-planetary nebulae were applicable to young planetary nebulae as expected since the latter are the immediate successors of the former in an evolutionary sense. However, there some notable differences which required additional classification criteria; this indicates that new physical processes may have become operational during the evolution from the pre-planetary nebulae to the young planetary nebulae phase. In addition, expansion ages and masses of the planetary nebulae were derived. The ages were found to be typically 5,000 to 10,000 years, consistent with their classification as young planetary nebulae. Properly classifying these planetary nebulae will assist in ultimately understanding the physical processes responsible behind the development of their morphologies.
Morris Marita
Sahai Raghvendra
Villar Gregorio III
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