IN a letter to NATURE of February 11, Prof. J. W. Nicholson discusses the recent interesting experiments of Mr. Evans on the spectrum emitted from a vacuum tube containing highly purified helium and ...
NEAR the normal positions of the diffuse series lines of both par- and ortho-helium, one finds very broad absorption lines in the spectrum of many B-type stars. The symmetry of each structure is ...
This is a preview. Log in through your library . Abstract Coude spectra of K CMa in the red region show Hα and He i λλ5876, 6678 in emission. Each of the lines has two emission components but the ...
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