LASER ACTION IN STELLAR ENVELOPES II. He I

Varshni,Y.P., Nasser,R.M.: 1986, Astrophys.Space Sci., 125, 341.

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Model calculations for laser action in He I are carried out, when helium plasma is rapidly cooled by expansion. Results are presented for four transitions, two of which, 3S to 2P singlet (7281 ) and 3D to 2P singlet (6678 ), show strong population inversion. Available observational evidence for possible laser action in these two lines in Wolf-Rayet and emission-line stars is summarized and discussed.'


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