The ^3HE Abundance in the Planetary Nebula NGC 3242

Details The ^3HE Abundance in the Planetary Nebula NGC 3242 The ^3HE Abundance in the Planetary Nebula NGC 3242

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...522l..73b&link_type=abstract

The Astrophysical Journal, Volume 522, Issue 1, pp. L73-L76.

Astronomy and Astrophysics

Astronomy

21

Ism: Abundances, Nuclear Reactions, Nucleosynthesis, Abundances, Ism: Planetary Nebulae: General, Radio Lines: Ism

Scientific paper

Using the NRAO 140 Foot Telescope, we have confirmed our earlier detection of ^3He in the planetary nebula NGC 3242 made with the 100 m radio telescope of the Max-Planck-Institut für Radioastronomie. Both spectrometers show that the observed ^3He^+ hyperfine line has a double-peaked structure. This line shape naturally arises if NGC 3242 is modeled as a dense core surrounded by a very low density expanding shell. The observed ^3He^+ emission suggests an abundance by number of ^3He/H=(2-5)x10^-4, which is more than an order of magnitude higher than typically found in Galactic H II regions.

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