The ionization structure of planetary nebulae.
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The ionization structure of planetary nebulae.

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Published by Dept. of Physics and Astronomy, Wheaton College, National Aeronautics and Space Administration in [Norton, Mass.], [Washington, D.C .
Written in English


  • Planetary nebulae

Book details:

Edition Notes

StatementTimothy Barker
SeriesNASA contractor report -- NASA CR-184566
ContributionsUnited States. National Aeronautics and Space Administration
The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL15022174M

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Belay Sitotaw Goshu, Ionization Structure of Heavy Metals for Planetary Nebulae, American Journal of Astronomy and 6, No. 2, , pp. Author: Belay Sitotaw Goshu. The starting point for the study of the ionization structure of planetary nebulae, and gaseous nebulae in general, is the ionization formula. The atoms can be ionized in two ways: under direct radiation of the central star, and by collisions with free electrons. In the first case one has photoionization, in the second, collisional : Grigor A. Gurzadyan. The Ionization Structure of Planetary Nebulae X. NGC TIMOTHY BARKER 1,2 Department of Physics and Astronomy Wheaton College Received October 3; 1Visiting Astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc., under contract with the. Forms and structure. Compared with diffuse nebulae (see H II region), planetary nebulae are small objects, having a radius typically of 1 light-year and containing a mass of gas of about solar mass. One of the largest-known planetary nebulae, the Helix Nebula (NGC ) in the constellation Aquarius, subtends an angle of about 20 minutes of arc—two-thirds the angular size of the Moon.

This authoritative volume presents a thoroughly modern understanding of planetary nebulae, integrating new developments in stellar physics with the dynamics of nebular evolution. It covers all the stages in the evolution of planetary nebulae, carefully synthesizes observations from across the spectrum and clearly explains all the key physical processes at work. Abstract: We report the detection of near-IR H$_2$ emission from the low-ionization structures (knots) in two planetary nebulae. The deepest ever, high-angular resolution H$_2$ S(1) at $\mu$, H$_2$ S(1) at $\mu$ and Br$\gamma$ images of K and NGC , obtained using the Near InfraRed Imager and Spectrometer (NIRI) at Gemini-North, are analyzed by:   Preface; 1. History and overview; 2. Ionization structure of planetary nebulae; 3. Nebular line radiation; 4. Nebular continuum radiation; 5. The neutral gas component; 6. The dust component; 7. Observations of the central star of planetary nebulae; 8. Morphologies of planetary nebulae; 9. Problems and questions; Asymptotic giant branch stars - progenitors of planetary nebulae; 11 Cited by: The 3-D ionization structure of the planetary nebula NGC Article in Astronomy and Astrophysics (3) March with 14 Reads How we measure 'reads'.

We study the physical structure of H II regions, including Planetary Nebulae (PNe), through detailed analysis of the ionization structure and spectra of iron in relevant ionization stages. 40 Belay Sitotaw Goshu: Ionization Structure of Heavy Metals for Planetary Nebulae The organization of this paper is as follows. The first section describe the properties of the planetary nebulae database from Infrared Astronomical Satellite (IRAS) as given in the literature, focusing on the mainAuthor: Belay Sitotaw Goshu. Low-ionization structures in planetary nebulae 3 Figure 1. Observed spectra of the NW jet in Wray (upper panel), covering the wavelength range of { A, obtained with [email protected], and SE outer NEB in NGC (lower panel) with a wavelength range of { A, and observed with the IDS attached to the Isaac Newton telescope Cited by: Coverage also describes exciting possibilities such as the use of planetary nebulae in determining the cosmic distance scale, the distribution of dark matter and the chemical evolution of galaxies. This book provides graduate students with an accessible introduction to planetary nebulae, and researchers with an authoritative reference.