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Astron. Astrophys. 324, 1005-1009 (1997)

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Do we see free precessing pulsars?

Andrej ade 1, Mirjam Galii 1 and Massimo Calvani 2

1 University of Ljubljana, Department of Physics, Ljubljana, Slovenia
2 Astronomical Observatory, Padova, Italy (andrej.cadez@uni-lj.si, mirjam.galicic@uni-lj.si, calvani@astrpd.pd.astro.it)

Received 9 July 1996 / Accepted 24 February 1997

Abstract

The evidence for free precessing neutron stars is discussed. Her X-1 and the Crab pulsar show periodic modulations in their light curves which can be ascribed to free precession. We show that both measured periods can be interpreted in terms of a unique model. It is interesting to note that the same model also explains well the eccentricities of rotating planets.

Key words: pulsars: individual: Her X-1 – stars: neutron – stars: rotation

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998

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