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The Most Oxygen-Poor Planetary Nebula

Published online by Cambridge University Press:  26 May 2016

Michael G. Richer ,
Gaghik Tovmassian ,
Grażyna Stasińska ,
Carlos Gutierrez  and
Christian Veillet
Michael G. Richer
Affiliation:
Observatorio Astronómico Nacional, Instituto de Astronomía, UNAM, P.O. Box 439027, San Diego, CA 92143-9027, USA
Gaghik Tovmassian
Affiliation:
Observatorio Astronómico Nacional, Instituto de Astronomía, UNAM, P.O. Box 439027, San Diego, CA 92143-9027, USA
Grażyna Stasińska
Affiliation:
Observatoire de Meudon, 5 Place Jules Janssen, Meudon Cedex, F-92195, Prance
Carlos Gutierrez
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea, s/n, La Laguna, Tenerife, Canary Islands E-38200, Spain
Christian Veillet
Affiliation:
Canada-France-Hawaii Telescope Corp., P.O. Box 1597, Kamuela, HI 96743, USA

Abstract

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PNG135.9+55.9 is a halo planetary nebula recently discovered among the objects from the Second Byurakan Survey. Based upon our first observations, a photoionization model analysis shows that the oxygen abundance in the nebula must be extremely low, probably 10-2–10-3 of the solar value. This finding has strong implications on our understanding of the formation of planetary nebulae, of mixing processes in the stellar progenitors and of the evolution of the Galactic halo.

Type
Part VIII: Planetary Nebulae as Galaxy Probes
Information
Symposium - International Astronomical Union , Volume 209: Planetary Nebulae: Their Evolution and Role in the Universe , 2003 , pp. 595 - 596
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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