Deuterium Astration in the Planetary Nebula Sh 2-216?

Details Deuterium Astration in the Planetary Nebula Sh 2-216? Deuterium Astration in the Planetary Nebula Sh 2-216?

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9207o&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #92.07; Bulletin of the American Astronomical Society, V

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Sh 2-216 is a large and old low surface brightness planetary nebula at a distance of 130 pc. Its central star, WD0439+466, has been observed by FUSE and STIS allowing us to derive abundances of several elements along the sightline: D/H = (0.76 + 0.12 -0.11)E-5, O/H = (0.89 + 0.13 0.11)E-4, and N/H = (3.24 + 0.61 0.53)E-5.
This fairly short sightline contains a large amount of hydrogen, most of which is in molecular form (J=0 through J=9), leading to an average volume density of 0.54 cm^(-3), higher than that of similar sightlines. In addition, we detect also absorption by HD J=0,1 and CO.
We argue that most of the gas along this sightline is associated with the planetary nebula and that the low D/H ratio is likely the result of this gas being recently astrated. This would be the first time that the D/H ratio has been directly measured in astrated gas. The O/H and N/H ratios derived here are lower than typical values measured in other PN; however there is a large scatter in PN abundances. For these two species, ionization corrections not taken into account here might be important.
Financial support to U. S. participants has been provided in part by NASA contract NAS5-32985 to Johns Hopkins University.

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