Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9204b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #92.04; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
We have downloaded, processed, and coadded every image of a planetary nebula (PN) and protoPN obtained with Hubble WFPC2 and ACS and available in the HST archives as of May 2006 (≈3700 images). Our immediate aim is to construct a high-resolution multi-filter catalogue of PNe and protoPNe to be posted on the web, along with image coordinates and primary references.
The next step in our work is to look anew at the range of PN and pPN morphologies. We will define new morphological classes and sequences separately for PNe and protoPNe, examine the frequencies of defining characteristics in the sample, and relate the observed symmetries to various types of theories for AGB mass ejection and subsequent mass shaping processes such as fast stellar winds. Already it is clear that the shapes of protoPNe are more various and complex than those of most PNe, showing that the structures initially imposed by AGB mass ejections are blurred by the momenta of ionization fronts and fast stellar winds that come later.
The final step will be to relate the morphologies of protoPNe to the evolutionary stages of their central stars.
This research is based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Support for this work was provided by NASA through grant number AR-10933 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.
Baerny J.
Balick Bruce
Hayward Scott
Pomeroy K.
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