Is there a propeller neutron star in $\gamma$ Cas?

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

$\gamma$ Cas is the prototype of a small population of B0-B1.5 III-V classical Be (cBe) stars that emit anomalous and hard X-rays with a unique array of properties. $\gamma$ Cas is known to…