Abstract
A simple model is presented for ionization-bounded PN which resolves the long-standing paradox of large limb brightening by taking into account the effect of inverse square dilution of the ionizing radiation from the central star. This greatly reduces emission from the ends of prolate nebulae, links the emission from different places in nebulae directly with the ionizing flux from the central star, and permits the calculation of reasonably accurate models, even when the density structure is not accurately known in detail. The appearance of a model taking the form of a hollow, prolate ellipsoidal shell, with an axial ratio of about 2.3, is calculated. Viewed from different angles, this structure can reproduce the shapes of many typical PN. In particular, it gives a better account of the structure of the Ring Nebula than any of the previously suggested models. The model is used to reinterpret previous measurements of optical emission lines across the face of the Ring Nebula. 20 refs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
