Dust, helium abundance

Details Dust, helium abundance Dust, helium abundance

Sep 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mmsai..47..407s&link_type=abstract

Società Astronomica Italiana, Memorie, vol. 47, Sept. 1976, p. 407-415.

Astronomy and Astrophysics

Astronomy

Abundance, Cosmic Dust, Helium, Interstellar Gas, Ultraviolet Astronomy, Absorption Cross Sections, Big Bang Cosmology, H Ii Regions, Helium Ions, Interstellar Extinction, Photoionization

Scientific paper

The use of ultraviolet observations to study dust in the interstellar medium is discussed; the abundance of helium in the universe is also investigated. In particular, problems associated with determining the absorption and scattering cross-sections of the dust particles are reviewed. Determinations of helium abundances through He radio recombination lines from the H II regions is also mentioned. Observations consistent with a He abundance of 10 percent and a low degree of ionization are cited.

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