Helium-3: Status and Prospects

Details Helium-3: Status and Prospects Helium-3: Status and Prospects

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ssrv...84..185r&link_type=abstract

Space Science Reviews, v. 84, Issue 1/2, p. 185-198 (1998).

Physics

14

3-Helium, Cosmic Abundance, Planetary Nebula, Chemical Evolution

Scientific paper

We report on our continuing efforts to determine 3He abundances in H II regions and planetary nebulae. Our detections of 3He in some PNe show that some stars produce large amounts of 3He. However the H II region abundances show no evidence for this production. From our sample of > 40 H II regions, the subsample which should yield the most reliable abundances has 3He/H abundances which scatter between 1-2 x 10-5. There is no trend with either galactocentric distance or metallicity. Even if we do not understand the underlying mechanisms, we see empirically that stars neither produce nor destroy 3He in a major way. We thus suggest that the level of the "3He Plateau" (3He/H = $$1.5_{-0.5}^{+1.0}$$ x 10-5) is a reasonable estimate for the primordial 3He.

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