Circular polarization survey of intermediate polars I. Northern targets in the range 17 h < RA < 23 h

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Table 4:

Observing log.
Name	Start time	End time	Duration	No. of $P_{\rm orb}$	No. of $P_{\rm spin}$	Filters	Exposure time^b	Resolution^c	V^d
	(HJD^a)	(HJD^a)	(mins)				(s)	(s)	(mag)
DQ Her	13 948.4240	13 948.5349	159.7	0.57	67.4	UBVRI	$1\times10$	$\sim$ 24	14.5
RXJ2133	13 948.5732	13 948.6542	116.6	0.27	12.3	UBVRI	$4\times10$	$\sim$ 96	15.3
FO Aqr	13 948.6933	13 948.7091	22.8	0.08	1.1^e	UBVRI	$2\times10$	$\sim$ 48	13.9
AE Aqr	13 949.5103	13 949.5704	86.5	0.15	156.8	UBVRI	$1\times3$	$\sim$ 8.5	11.4
V2306 Cyg	13 949.5794	13 949.6528	105.7	0.40	4.3	UBVRI	$2\times10$	$\sim$ 48	14.7
AO Psc	13 949.7047	13 949.7194	21.2	0.10	1.6^e	UBVRI	$2\times10$	$\sim$ 48	13.2
RXJ1730	13 950.4112	13 950.5134	147.2	0.16	69.0	UBVRI	$1\times10$	$\sim$ 24	16.3
V1223 Sgr	13 950.5298	13 950.5871	82.5	0.41	6.6	UBVRI	$2\times10$	$\sim$ 48	13.7
AE Aqr	13 950.6224	13 950.6366	20.4	0.03	37.0	UBVRI	$1\times1$	$\sim$ 4.5	11.6
RXJ2133	13 950.6455	13 950.7187	105.4	0.24	11.1	UBVRI	$4\times10$	$\sim$ 96	15.2

^a +2 440 000; ^b the number of orientations of the wave plate, and the time spent at each orientation; ^c the resolution is roughly the number of orientations of the wave plate multiplied by the exposure time multiplied by two (to account for the ordinary and extraordinary measurements) plus some mechanical dead time; ^d measured; ^e these data sets are short and therefore the reported uncertainties are probably underestimated.

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