Exploring polarization and geometry in the X-ray pulsar 4U 1538−52

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Table 2.

Normalized Stokes parameters q and u, PD, and PA for the phase-averaged data of 4U 1538−52 for Obs. 1–5 using the pcube algorithm.

Interval	q	u	PD	PA
	(%)	(%)	(%)	(deg)
Obs. 1	3.1 ± 2.1	0.2 ± 2.1	3.1 ± 2.1	2 ± 19
Obs. 2–3	0.3 ± 2.4	−3.1 ± 2.4	3.1 ± 2.4	−43 ± 22
Obs. 4	2.4 ± 2.0	−1.3 ± 2.0	2.7 ± 2.0	−15 ± 21
Obs. 5 ^(a)	4.0 ± 2.5	−3.6 ± 2.5	5.4 ± 2.5	−21 ± 13

Obs. 1–5 ^(a)	2.5 ± 1.1	−1.7 ± 1.1	3.0 ± 1.1	−18 ± 11

Notes. Uncertainties are given at the 68.3% (1σ) c.l. The individual observations do not show significant detections, therefore the PA values represent only the most likely directions.

^(a)

Excluding dip.

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