EDP Sciences
Free access
Volume 403, Number 2, May IV 2003
Page(s) 419 - 424
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20030402

A&A 403, 419-424 (2003)
DOI: 10.1051/0004-6361:20030402

Gravitational radiation from the magnetic field of a strongly magnetized star

R. Lapiedra1 and J. A. Miralles2

1  Departament d'Astronomia i Astrofísica, Universitat de València, Campus de Burjassot, 46100 Burjassot (València), Spain
2  Departament de Física Aplicada, Universitat d'Alacant, Apartat de Correus 99, 03080 Alacant, Spain

(Received 21 November 2002 / Accepted 5 March 2003)

We consider the electromagnetic (e.m.) field of a compact strongly magnetized star. The star is idealized as a perfect conducting sphere, rigidly rotating in a vacuum, with a magnetic moment not aligned with its rotation axis. Then we use the exterior e.m. solution, obtained by Deutsch (1955) in his classic paper, to calculate the gravitational waves emitted by the e.m. field when its wavelength is much longer than the radius of the star. In some astrophysical situations, this gravitational radiation can overcome the quadrupole one emitted by the matter of the star, and, for some magnetars, would be detectable in the near future, once the present detectors, planned or under construction, become operative.

Key words: gravitational waves -- stars: magnetic fields -- stars: neutron

Offprint request: R. Lapiedra, ramon.lapiedra@uv.es

© ESO 2003