The Possibility of Observing an Emission Spectrum of the Calcium Substratum in the Galaxy

Details The Possibility of Observing an Emission Spectrum of the Calcium Substratum in the Galaxy The Possibility of Observing an Emission Spectrum of the Calcium Substratum in the Galaxy

Aug 1929

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1929natur.124..179o&link_type=abstract

Nature, Volume 124, Issue 3118, pp. 179-180 (1929).

Astronomy and Astrophysics

Astrophysics

Scientific paper

IN a very interesting paper, ``Physical Properties of a Gaseous Substratum in the Galaxy'' (Astrophys. Jour., 69, p. 7; 1929), Gerasimovi&cbreve and Struve have recently given strong evidence of a uniform gaseous medium of calcium in interstellar space. The absorption coefficient per parsec for the interstellar K line was found by them to be 3.4 × 10-4. If such a general calcium substratum exists, the question may arise: Is the density of this substratum strong enough to allow the emission spectrum of the Ca+ atoms to be expected in the spectrum of the night sky?

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