Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-08-31
Astrophys.J. 614 (2004) L49-L52
Astronomy and Astrophysics
Astrophysics
Accepted for publication on ApJL (3 pages +2 color figures, references added)
Scientific paper
10.1086/425495
Millisecond radio pulsars are neutron stars that have been spun-up by the transfer of angular momentum during the low-mass X-ray binary phase. The transition from an accretion-powered to a rotation-powered pulsar takes place on evolutionary timescales at the end of the accretion process, however it may also occur sporadically in systems undergoing transient X-ray activity. We have obtained the first optical spectrum of the low mass transient X-ray pulsar SAX J1808.4-3658 in quiescence. Similar to the black widow millisecond pulsar B1957+20, this X-ray pulsar shows a large optical modulation at the orbital period due to an irradiated companion star. Using the brightness of the companion star as a bolometer, we conclude that a very high irradiating luminosity, a factor of ~100 larger than directly observed, must be present in the system. This most likely derives from a rotation-powered neutron star that resumes activity during quiescence.
Campana Sergio
Casares Jorge
Charles Phil
Covino Stefano
D'Avanzo Paolo
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