Volume 415, Number 2, February IV 2004
|Page(s)||L31 - L34|
|Published online||11 February 2004|
Letter to the Editor
Long-term variability in the X-ray emission of RX J0720.4-3125
SRON, National Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Astronomical Institute, Utrecht University, PO Box 80000, 3508 TA Utrecht, The Netherlands
Corresponding author: C.P. de Vries, C.Pde.Vries@sron.nl
Accepted: 14 January 2004
We detect a gradual, long-term change in the shape of the X-ray spectrum of the isolated neutron star RX J0720.4-3125, such that the spectrum of the source can no longer be described as a blackbody spectrum. The change is accompanied by an energy-dependent change in the pulse profile. If the X-ray emission is influenced by the magnetic field of the pulsar, these changes in spectral shape may point to precession of the neutron star.
Key words: neutron stars / X-rays
© ESO, 2004
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