SIMBAD references

2006A&A...451L..17H - Astronomy and Astrophysics, volume 451, L17-21 (2006/5-4)

Evidence for precession of the isolated neutron star RXJ0720.4-3125.

HABERL F., TUROLLA R., DE VRIES C.P., ZANE S., VINK J., MENDEZ M. and VERBUNT F.

Abstract (from CDS):

The XMM-Newton spectra of the isolated neutron star RXJ0720.4-3125 obtained over 4.5-years can be described by sinusoidal variations in the inferred blackbody temperature, the size of the emitting area and the depth of the absorption line with a period of 7.1±0.5-years, which we suggest to be the precession period of the neutron star. Precession of a neutron star with two hot spots of different temperature and size, probably not located exactly in antipodal positions, may account for the variations in the X-ray spectra, changes in the pulsed fraction, shape of the light curve and the phase-lag between soft and hard energy bands observed from RXJ0720.4-3125. An independent sinusoidal fit to published and new pulse timing residuals from a coherent analysis covering ∼12-years yields a consistent period of 7.7±0.6-years supporting the precession model.

Abstract Copyright:

Journal keyword(s): stars: individual: RXJ0720.4-3125 - stars: neutron - stars: magnetic fields - X-rays: stars

Simbad objects: 2

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2021.06.22-16:41:20

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