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| Paper: |
Hubble Space Telescope Observations of New
Rings in AGB Stars, PPN and PN |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
401 |
| Authors: |
Ramos-Larios, G.; Santamaría, E.; Guerrero, M. A.; Sabin, L.; Marquez-Lugo, R. A. |
| Abstract: |
Many planetary nebulae (PNe) show rings and shells related to the
remnants of the circumstellar envelopes of the asymptotic giant
branch (AGB) phase. We have extensively analysed the Hubble Space
Telescope (HST) archives and found ring-like structures in
several PNe. Following the image analysis described in Corradi et al. (2004), and using unsharp masking techniques,
it was possible to enhance the ring structures. In this study, we
also find new rings in pre-planetary nebulae (PPNe) and some AGB
and post-AGB stars. |
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