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Astron. Astrophys. 354, 163-168 (2000)

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Pulsars ellipticity revised

C. Palomba 1,2

1 Dipartimento di Fisica "G. Marconi", Università di Roma "La Sapienza"
2 Sezione INFN Roma1, p.le A. Moro 5, 00185 Roma, Italy

Received 4 August 1999 / Accepted 23 November 1999


We derive new upper limits on the ellipticity of pulsars whose braking index has been measured, more tightening than those usually given, assuming that both a gravitational torque and an electromagnetic one act on them. We show that the measured braking indexes of pulsars are recovered in this model. We consider the electromagnetic torque both constant and varying with time. At the same time constraints on the pulsars initial period and on the amplitude of the gravitational waves emitted are obtained.

Key words: gravitational waves – magnetic fields – stars: pulsars: individual: Crab – stars: pulsars: individual: Vela – stars: pulsars: individual: PSR 0540-69 – stars: pulsars: individual: PSR 1509-58

Correspondence to: cristiano.palomba@roma1.infn.it

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000