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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 |
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Keywords: | planetary nebulae: individual: PNG 135.9+55.9 |
Research Division: | Physical Sciences |
Research Group: | Astronomical sciences |
Research Field: | Stellar astronomy and planetary systems |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the physical sciences |
UTAS 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: | 495 View Download Statistics |
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