The probable detection of interstellar He-3/+/ and its significance

Details The probable detection of interstellar He-3/+/ and its significance The probable detection of interstellar He-3/+/ and its significance

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l..97r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Jan. 15, 1979, p. L97-L101.

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21

Abundance, Helium, Interstellar Gas, Planetary Nebulae, H Ii Regions, Hyperfine Structure

Scientific paper

A search has been conducted for the hyperfine line of He-3(+) at 8.7 GHz in several H II regions and in planetary nebulae located more than 500 pc from the galactic plane. A probable detection of He-3(+) in W51 is reported, along with an He-3(+)/H(+) abundance ratio of about 0.00004 by number for this source and upper limits to the He-3(+) abundance in five other sources. The ratio of He-3(+) to H(+) in W51 is found to be equal to the ratio of He-3 to H, and the relative abundance in W51 is estimated to be roughly comparable to the protosolar value. It is tentatively concluded that the contribution of He-3 to the interstellar medium by low-mass stars is much smaller than that estimated by Rood et al. (1976).

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