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Planetary Nebulae in the Andromeda Galaxy and its Companions

Published online by Cambridge University Press:  22 September 2016

Holland C. Ford
Holland C. Ford*
Affiliation:
University of California, Los Angeles, California, U.S.A.

Extract

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The identification and observation of planetary nebulae in the Andromeda galaxy (M31) and its companions provide a powerful means of studying their old stellar populations. The direct determination of chemical abundances and radial velocities for even the brightest individual old stars is impossible at the distance of M31. The strongest emission lines of planetary nebulae are as bright as the entire visual continuum of the most luminous giants. Consequently, spectrophotometry of planetary nebulae presently provides the only direct measure of chemical abundances, and, with the exception of globular clusters, the only radial velocity determinations for the old populations.

Type
Session I: The Distribution of Planetary Nebulae
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 19 - 34
Copyright
Copyright © Reidel 1978 

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