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Letter to the Editor
On some features of free precession of a triaxial body: the case of Her X-1
Received 6 November 1997 / Accepted 23 December 1997
We show that the free precession of a triaxial body can naturally explain the anomalously rapid change of the X-ray pulse profile of Her X-1 observed by the HEAO-1 in September 1978 without requiring a large change in the moment of inertia.
Key words: stars: neutron stars: individual: Her X-1
© European Southern Observatory (ESO) 1998
Online publication: March 3, 1998