2020ApJ...898...38B

Query : 2020ApJ...898...38B

2020ApJ...898...38B - Astrophys. J., 898, 38-38 (2020/July-3)

Timing the pulsations of the accreting millisecond pulsar SAX J1808.4-3658 during its 2019 outburst.

BULT P., CHAKRABARTY D., ARZOUMANIAN Z., GENDREAU K.C., GUILLOT S., MALACARIA C., RAY P.S. and STROHMAYER T.E.

Abstract (from CDS):

In this paper we present a coherent timing analysis of the 401 Hz pulsations of the accreting millisecond X-ray pulsar SAX J1808.4-3658 during its 2019 outburst. Using observations collected with the Neutron Star Interior Composition Explorer (NICER), we establish the pulsar spin frequency and orbital phase during its latest epoch. We find that the 2019 outburst shows a pronounced evolution in pulse phase over the course of the outburst. These phase shifts are found to correlate with the source flux and are interpreted in terms of hot-spot drift on the stellar surface, driven by changes in the mass accretion rate. Additionally, we find that the long-term evolution of the pulsar spin frequency shows evidence for a modulation at the Earth's orbital period, allowing for pulsar timing based astrometry of this accreting millisecond pulsar.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Millisecond pulsars - Low-mass X-ray binary stars

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 : 2020ApJ...898...38B

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)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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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

Link by name to the catalogue in VizieR :

V* V4580 Sgr

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