A universal relation for the propeller mechanisms in magnetic rotating stars at different scales

摘要: Accretion of matter onto a magnetic, rotating object can be strongly affected by the interaction with its magnetic field. This occurs in variety astrophysical settings involving young stellar objects, white dwarfs, and neutron stars. As is endowed angular momentum, inflow toward star often mediated an accretion disc. The pressure that originating from field balance at magnetospheric radius: smaller distances motion dominated field, funnelling towards poles ensues. However, if star, thus magnetosphere, fast spinning, most inflowing will halted radius centrifugal forces, resulting characteristic reduction luminosity. onset this mechanism, called propeller, has been widely adopted to interpret distinctive knee decaying phase light curve several transiently accreting X-ray pulsar systems. By comparing observed luminosity for different classes objects value predicted theory on basis independently measured spin-period, mass, we disclose here general relation propeller which spans about eight orders magnitude spin period ten moment. parameter-dependence normalisation constant determine are agreement basic theory.