HEAO 3 discovery of Al-26 in the interstellar medium

Details HEAO 3 discovery of Al-26 in the interstellar medium HEAO 3 discovery of Al-26 in the interstellar medium

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286..578m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 15, 1984, p. 578-585. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

209

Abundance, Aluminum 26, Gamma Ray Spectrometers, Heao 3, Interstellar Matter, Nuclear Fusion, Galactic Radiation, Spatial Distribution

Scientific paper

A new analysis technique was used with HEAO 3 satellite gamma ray data to quantify the galactic 1809 keV emission. A method of bins was applied in summing for specific scan directions, followed by fitting the source and background components. The 1809 keV line of Al-26 was significant because of the recent discovery that Al-26 was overabundant in meteoritic material and implanted during solar system formation. The HEAO 3 flux indicated a current decay of 3 solar masses of Al-26 per year in the interstellar medium, possibly occurring in red giants and massive main sequence stars. The ratio of the observed Al-26 to the Al-27 flux was similar to that measured in meteorites, which suggests that the ratio is normal for the galactic medium and that no supernova triggered the protosolar nebular collapse.

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