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The X-ray emission of the γ Cassiopeiae stars

Smith, Myron A.; Motch, C.; Lopes de Oliveira, R.

Long considered as the ;odd man out; among X-ray emitting Be stars, γ Cas (B0.5e IV) is now recognized as the prototype of a class of stars that emit hard thermal X-rays. Our classification differs from the historical use of the term ; γ Cas stars; defined from optical properties alone. The luminosity output of this class contributes significantly…