Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...126...31p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 126, no. 1, Sept. 1983, p. 31-44.
Astronomy and Astrophysics
Astrophysics
130
Planetary Nebulae, Stellar Temperature, Optical Thickness, Photoionization, Tables (Data), Temperature Measurement
Scientific paper
A method is developed for determining the color temperature of the ionizing continuum of the central star photoionizing a surrounding nebula. The basis of this method rests on the assumption that energy balance holds in the photoionized nebula. This method is a generalization of Stoy's first derivation (1933) to several possible situations in actual nebulae, including the optically thin, partially thick, and completely optically thick nebulae. An analytical expression is obtained for the energy balance temperature of the central stars of low excitation nebulae. The energy balance temperature for 51 planetary nebulae are derived and the results are shown to be fairly insensitive to the optical depth of the surrounding nebula. A good consistency is obtained between the computed energy balance temperatures and the Zanstra temperatures. These findings are employed to predict the apparent visual magnitude of central stars not yet observed or only marginally detected.
Pottasch Stuart R.
Preite-Martinez Andrea
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