2003A&A...399..231C


Query : 2003A&A...399..231C

2003A&A...399..231C - Astronomy and Astrophysics, volume 399, 231-235 (2003/2-3)

Periodicities in rotation and DM of PSR B1557-50.

CHUKWUDE A.E., UBACHUKWU A.A. and OKEKE P.N.

Abstract (from CDS):

We have analysed the pulse arrival time data of the pulsar B1557-50 collected over a period of nearly 13 years, from 1986 July to 1999 May, in order to investigate the long-term spin behaviour. The results reveal sustained cyclic variations in both the timing residuals and dispersion measure (DM) of this object. Both the timing and DM sequences are well described by two harmonically-related periodicities of ∼1600 and 800 days. The variations in spin-down rate and DM are significantly anticorrelated in the sense that maximum {dot}(ν) corresponds to minimum DM. Interpretation of the data in terms of free precession of an isolated radio pulsar suggests a wobble angle θ≃0.01°. The data are consistent with at least 6.5% of the stellar moment of inertia being coupled to the crust.

Abstract Copyright:

Journal keyword(s): pulsars: general - pulsars: individual: B1557-50

CDS comments: PSR B1257-12 is a misprint for PSR B1257+12.

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 PSR B1257+12 Psr 13 00 03.1075 +12 40 55.155           ~ 509 1
2 PSR B1557-50 Psr 16 00 53.0150 -50 44 21.300           ~ 104 0
3 PSR B1642-03 Psr 16 45 02.0330 -03 17 57.200           ~ 345 0
4 PSR B1828-10 Psr 18 30 47.566 -10 59 27.90           ~ 156 1

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2023.02.02-17:54:32

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