Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-09
Astron.Astrophys. 395 (2002) 929-942
Astronomy and Astrophysics
Astrophysics
14 pages, 7 figures, accepted for publication in Astronomy and Astrophysics
Scientific paper
10.1051/0004-6361:20021315
We present extensive new spectroscopy and imaging of PN G 135.9+55.9. We use these data as constraints to photoionization models to derive limits on the oxygen abundance. We find that PN G 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 PN G 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 PN G 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 Ha/Hb is lower than expected and perhaps variable, a finding for which we have no clear explanation.
Dobbie Paul D.
Gutierrez Carlos
Jameson Richard F.
Prada Francisco
Richer Michael Gerard
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