Keywords
planetary nebulae: individual (NGC 7027
Hb 4)
techniques: image processing
Astrophysics - Galaxy Astrophysics
Hb 4)
techniques: image processing
Astrophysics - Galaxy Astrophysics
How to Cite
Ionization-bounded and Density-bounded Planetary Nebulae. (2009). Revista Mexicana De Astronomía Y Astrofísica, 45(1), 85-89. https://astronomia.unam.mx/journals/rmxaa/article/view/2009rmxaa..45...85r
Abstract
Planetary nebulae (and in general any photoionized region) can be classified as ionization-bounded or density-bounded. It is important to determine in which case is the planetary nebula studied to be able to estimate from nebular observations, for example, the total rate of ionizing photons produced by the central star. In this paper we present a simple observational criterion that uses radio continuum images and allows to establish a necessary (but not sufficient) condition for the planetary nebula to be considered as ionization-bounded. We apply the criterion to two planetary nebulae: NGC 7027 is most possibly ionization-bounded, while Hb 4 is density-bounded, at least in some directions.Similar Articles
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