Laser action in stellar envelopes. II - He I

Details Laser action in stellar envelopes. II - He I Laser action in stellar envelopes. II - He I

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.125..341v&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 125, no. 2, Aug. 1986, p. 341-360. NSERC-supported research.

Physics

6

Helium Plasma, Lasing, Stellar Envelopes, Stellar Physics, Atomic Energy Levels, Radiative Recombination, Stellar Models, Transition Probabilities, Wolf-Rayet Stars

Scientific paper

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, 31S→21P0(λ7281) and 31D→21P0(λ6678), 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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