The double-peaked 2008 outburst of the accreting milli-second X-ray pulsar, IGR J00291+5934

F. Lewis; D. M. Russell; P. G. Jonker; M. Linares; V. Tudose; P. Roche; J. S. Clark; M. A. P. Torres; D. Maitra; C. G. Bassa; D. Steeghs; A. Patruno; S. Migliari; R. Wijnands; G. Nelemans; L. J. Kewley; V. E. Stroud; M. Modjaz; J. S. Bloom; C. H. Blake; D. Starr

doi:10.1051/0004-6361/201014382

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Volume 517 (July 2010)

A&A, 517 (2010) A72

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Table 7:

Variability of 00291+59 and a faint field star.
Date	--- Field star ---		------------- 00291+59 ------------
	mean mag	1 $\sigma$ range	mean mag	1 $\sigma$ range	Significance of variability	Variability level¹
15 Aug.	i' = 19.127	0.014	i' = 18.016	0.043	3.2 $\sigma$	$43 \pm 14$
	r' = 19.172	0.029	r' = 17.833	0.041	1.4 $\sigma$	<130
16 Aug.	i' = 19.121	0.028	i' = 18.043	0.045	1.6 $\sigma$	<130
	r' = 19.188	0.042	r' = 17.954	0.048	1.2 $\sigma$	<170
17 Aug.	i' = 19.094	0.038	i' = 18.447	0.086	2.3 $\sigma$	$86 \pm 38$
	r' = 19.144	0.070	r' = 18.296	0.057	0.8 $\sigma$	<270
18 Aug.	i' = 19.109	0.033	i' = 18.935	0.079	2.4 $\sigma$	$79 \pm 33$
19 Aug.	i' = 19.118	0.032	i' = 19.378	0.077	2.4 $\sigma$	$77 \pm 32$
25 Sep.	i' = 19.139	0.023	i' = 18.206	0.026	1.0 $\sigma$	<110
29 Sep.	i' = 19.140	0.030	i' = 18.543	0.033	1.1 $\sigma$	<120

Notes. ⁽¹⁾ The level of variability in milli-mag (when it is detected at the >2 $\sigma$ level), or 3 $\sigma$ upper limit.

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