Revised Orbital Parameters of the Accreting Millisecond Pulsar SAX J1808.4-3658
- Authors: PAPITTO A; MENNA M T; BURDERI L; DI SALVO T; D'ANTONA F; ROBBA N R
- Publication year: 2005
- Type: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/21329
Abstract
We present a temporal analysis of the three outbursts of the X-ray millisecond pulsar SAX J1808.4-3658 that occurred in 1998, 2000, and 2002. With a technique that uses the χ2 obtained with an epoch-folding search to discriminate between different possible orbital solutions, we find an unique solution valid over the whole 5 yr period for which high temporal resolution data are available. We revise the estimate of the orbital period, Porb=7249.1569(1) s, and reduce the corresponding error by 1 order of magnitude with respect to that previously reported. Moreover, we report the first constraint on the orbital period derivative, -6.6×10-12