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Indirect evidence for an active radio pulsar in the quiescent state of the transient ms pulsar SAX J1808.4-3658 | | S. Campana
; P. D’Avanzo
; J. Casares
; S. Covino
; G.L. Israel
; G. Marconi
; Rob Hynes
; P. Charles
; L. Stella
; | | Date: |
31 Aug 2004 | | Journal: | Astrophys.J. 614 (2004) L49-L52 | | Subject: | astro-ph | | Affiliation: | OA Brera), P. D’Avanzo (OA Brera), J. Casares (IAC), S. Covino (OA Brera), G.L. Israel (OA Roma), G. Marconi (OA Roma), Rob Hynes (Univ. Texas), P. Charles (Univ. Southampton), L. Stella (OA Roma | | Abstract: | 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. | | Source: | arXiv, astro-ph/0408584 | | Services: | Forum | Review | PDF | Favorites | |
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