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Chemical Abundances of Planetary Nebulae in NGC 185, 205, and 221

Published online by Cambridge University Press:  22 September 2016

David C. Jenner  and
Holland C. Ford
David C. Jenner
Affiliation:
Department of Astronomy, University of California, Los Angeles
Holland C. Ford
Affiliation:
Department of Astronomy, University of California, Los Angeles

Extract

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Results are most complete for NGC 185–1, where the electron temperature is 17,900±1600°K. Compared to typical galactic planetary nebulae the abundance ratio in NGC 185–1 of helium/hydrogen (0.24±0.08) is approximately twice that normally found, the abundance ratio of oxygen/hydrogen (7.7±1.3)10−5 is approximately one-tenth that normally found, and the ratio of nitrogen/hydrogen (1.4 × 10−4, poorly known) is approximately equal to that normally found.

Type
Session V: Chemical Abundances
Information
Symposium - International Astronomical Union , Volume 76: Planetary Nebulae , 1978 , pp. 246
Copyright
Copyright © Reidel 1978