Abstract
The interstellar lines of MgII and MgI in the spectra of γ Cas and γ, β, δ, ɛ and ζ Ori have been observed with a balloon-borne objective grating spectrograph. The column density of Mg relative to H is close to the cosmic value for the Orion stars, but is somewhat lower for γ Cas. Excluding β Ori, the average value of electron density obtained for the cool clouds in the lines of sight to these stars is (2.8+1.6−1.0) 10−3 cm−3, assuming a cloud temperature of 60 K.
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BOKSENBERG, A., KIRKHAM, B., TOWLSON, W. et al. Interstellar Magnesium Abundances and Electron Density in the Direction of Orion and Cassiopeia. Nature Physical Science 240, 127–130 (1972). https://doi.org/10.1038/physci240127a0
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DOI: https://doi.org/10.1038/physci240127a0
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