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The Most Oxygen-Poor Planetary Nebula

  • Michael G. Richer (a1), Gaghik Tovmassian (a1), Grażyna Stasińska (a2), Carlos Gutierrez (a3) and Christian Veillet (a4)...

Abstract

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.

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References

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Boesgaard, A.M., King, J.R., Deliyannis, C.P., & Vogt, S.S., 1999, AJ, 117, 492
Howard, J.W., Henry, R. B. C., & McCartney, S., 1997, MNRAS, 284, 465
Izotov, Y.I. et al 1999, ApJ 527, 757
Olive, K.A., Steigman, G., & Skillman, E.D., 1997, ApJ 483, 788
Tovmassian, G.H. et al 2001, A&A, 370, 456

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