Abstract
A gaseous nebula is an ionized low-density plasma, very large in size compared with laboratory or even stellar dimensions. There exist a great variety of these objects. Densities range from a few ions and electrons/cm3 to perhaps 1012/cm3, beyond which point the plasma resembles the photosphere or chromosphere of a stellar atmosphere. We restrict our attention to ionized plasmas that emit observable spectral lines and continua. The gas kinetic temperatures of these objects, as measured by speeds of ions and electrons, range from a few thousand degrees in galactic diffuse nebulae to several hundred thousands or even millions in the highly attenuated bubbles associated with supernova events. Our main attention, however, will be devoted to objects with gas kinetic temperatures between 5000°K and 30,000°K.
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© 1984 D. Reidel Publishing Company, Dordrecht, Holland
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Aller, L.H. (1984). Types of Gaseous Nebulae. In: Physics of Thermal Gaseous Nebulae. Astrophysics and Space Science Library, vol 112. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9639-3_1
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DOI: https://doi.org/10.1007/978-94-010-9639-3_1
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