ROSAT observations of A0538-66 during quiescence
Received 26 July 1996 / Accepted 9 October 1996
We discuss serendipitous ROSAT observations of the Be transient A0538-66, which contains the fastest known accreting X-ray pulsar (69 ms). We show that this transient is detected several times during quiescence at a level of about erg s-1. Considering this low luminosity it is more likely that X-rays are produced by matter falling onto the neutron star magnetosphere, rather than onto the star surface. This could be the first example of an X-ray source in the "propeller regime".
Key words: stars: individual: A0538-66 X-ray: stars accretion
© European Southern Observatory (ESO) 1997
Online publication: June 30, 1998