Recombination Lines at λ3 cm from the Core of the Orion Nebula

Details Recombination Lines at λ3 cm from the Core of the Orion Nebula Recombination Lines at λ3 cm from the Core of the Orion Nebula

Jul 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970apl.....6...27g&link_type=abstract

Astrophysical Letters, Vol. 6, p.27-34

Astronomy and Astrophysics

Astrophysics

18

Scientific paper

Observations of the 85α and 106β recombination lines show helium and hydrogen to have similar states of thermodynamic equilibrium and imply the ratio of helium to hydrogen number densities to be 0.073 ± 0.008. The 85α, 106β, 121γ, and 133δ hydrogen line intensities are consistent with a mean electron temperature of 10[4] K over the core of the nebula but imply variations in temperature and hence variations in physical conditions over intervals of 1.5 arc min.

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