2005ApJ...621L.113P

Query : 2005ApJ...621L.113P

2005ApJ...621L.113P - Astrophys. J., 621, L113-L116 (2005/March-2)

Revised orbital parameters of the accreting millisecond pulsar SAX J1808.4-3658.

PAPITTO A., MENNA M.T., BURDERI L., DI SALVO T., D'ANTONA F. and ROBBA N.R.

Abstract (from CDS):

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, -6.6x10–12<P{dot}orb<+0.8x10–12 s/s. These values allow us to produce, via a folding technique, pulse profiles at any given time. Analysis of these profiles shows that the pulse shape is clearly asymmetric in 2002, occasionally showing a secondary peak at about 145° from the main pulse, which is quite different from the almost sinusoidal shape reported at the beginning of the 1998 outburst.

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Journal keyword(s): Stars: Pulsars: General - Stars: Pulsars: Individual: Alphanumeric: SAX J1808.4-3658 - Stars: Magnetic Fields - Stars: Neutron - X-Rays: Binaries

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SAX J1808.4-3658 LXB 18 08 27.58 -36 58 43.9           ~ 1051 0

Query : 2005ApJ...621L.113P

Basic data :
SAX J1808.4-3658 -- Low Mass X-ray Binary
Other object types: otypes_help 		X (2022MNRAS,PBC,...), LXB (2013ApJS), * (2008ApJ,[RCM98]), Psr (PSR), N* (2014MNRAS), V* (V*), gam (INTREF), Rad ([GSG99])
ICRS coord. (ep=J2000) : 		18 08 27.58 -36 58 43.9 (X-ray) [ 1500 1500 90 ] D 2020A&A...641A.136W
FK4 coord. (ep=B1950 eq=1950) : 		18 05 03.50 -36 59 13.4 [ 1500 1500 90 ]
Gal coord. (ep=J2000) : 		355.38517 -08.14832 [ 1500 1500 90 ]
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Identifiers (14) :
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INTREF 881 SWIFT J1808.5-3655 V* V4580 Sgr [GSG99] J180827.6-365843.9
PBC J1808.3-3656 SwXF4 J180827.6-365842 2XMM J180827.7-365841 [RCM98] J180827.5-365842
PSR J1808-3658 1SXPS J180827.6-365843 4XMM J180827.5-365843
SAX J1808.4-3658 2SXPS J180827.5-365842 XTE J1808-369

References (1051 between 1850 and 2026) (Total 1051)
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Observing logs

XMM : 4   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : SAX J1808.4-3658

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V* V4580 Sgr

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