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The alpha-element abundances in the most oxygen-poor planetary nebula PNG 135.9+55.9

Citation

Richer, MG and Tovmassian, G and Stasinska, G and Jameson, RF and Dobbie, PD and Veillet, C and Gutierrez, C and Prada, F, The alpha-element abundances in the most oxygen-poor planetary nebula PNG 135.9+55.9, Astronomy and Astrophysics: A European Journal, 395, (3) pp. 929 - 941. ISSN 0004-6361 (2002) [Refereed Article]


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Copyright Statement

Copyright 2002 ESO

DOI: doi:10.1051/0004-6361:20021315

Abstract

We present extensive new spectroscopy and imaging of PNG 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find that PNG 135.9+55.9 has an oxygen abundance less than 1/50 of the solar value. Our models favour a value of 12 + log O/H between 5.8 and 6.5 dex, confirming that PNG 135.9+55.9 is the most oxygen-poor planetary nebula known (Tovmassian et al. 2001). We also derive Ne/O = 0.5 ± 0.3, S/O < 0.094, and Ar/O < 0.23. Although the value of Ne/O is nominally high, it need not imply that the progenitor of PNG 135.9+55.9 converted any of its initial oxygen abundance to neon. The helium abundance appears to be very low, He/H ~ 0.08, but a precise determination will require a much more detailed study. We find that Hα/Hβ is lower than expected and perhaps variable, a finding for which we have no clear explanation.

Item Details

Item Type:Refereed Article
Keywords:planetary nebulae: individual: PNG 135.9+55.9
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81174
Year Published:2002
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2012-11-26
Last Modified:2013-06-27
Downloads:417 View Download Statistics

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