期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 469, 期 2, 页码 1502-1509出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx926
关键词
accretion, accretion discs; stars: emission-line, Be; stars: individual; stars: massive; stars: neutron; X-rays: stars
资金
- Brazilian agencies Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [459553/2014-3, PQ 302037/2015-2]
- Agency Invicta de passagens (CNPq/San Paolo Research Foundation)
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 host, like other cBe stars, a decretion disc and also a low-mass companion. Recently, Postnov et al. have posited that this companion is a magnetized rapidly spinning neutron star that deflects direct gravitational accretion from a stellar/disc wind via the 'propeller mechanism'. These authors state that the key X-ray observations are 'remarkably well produced' in this scenario. We re-examine this mechanism in detail and conclude that there are a number of fatal objections in its application to the gamma Cas case. Among other considerations these issues include the prediction under the propeller scenario of a much smaller population of gamma Cas stars than is observed and the lack of allowance for observed correlations of X-ray and UV and/or optical properties over a variety of time-scales.
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