Optical observations of the peculiar high-mass X-ray binary 4U 2206+54

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Table 1.

Spectropolarimetric observations of 4U 2206+54 and the stars in the direction of 4U 2206+54.

Object	Date	UT	Exp. ^(a) (s)	Angular	Distance ^(b)	P_V (obs.)	PA_V (obs.)
				distance	(pc)	(%)	(deg)
	2018-10-05	18:30	1920			4.15 ± 0.05	38.4 ± 0.3
	2019-06-30	22:56	3200			4.03 ± 0.04	37.2 ± 0.3
4U 2206+54	2019-07-02	22:42	3200	–	$3104_{- 136}^{+ 133}$ $3104^{+133}_{-136}$	4.04 ± 0.04	38.8 ± 0.3
	2019-10-23	19:53	1920			4.05 ± 0.04	39.5 ± 0.3
	2019-10-24	19:54	1920			4.12 ± 0.04	37.3 ± 0.3

2MASS
22075650	2019-10-23	20:42	2400	1′	$6300_{- 811}^{+ 814}$ $6300^{+814}_{-811}$	3.16 ± 0.17	36.8 ± 2.4
+5432038

2MASS
22074905	2019-10-23	21:34	2400	1.8′	$2602_{- 192}^{+ 232}$ $2602^{+232}_{-192}$	3.65 ± 0.13	36.4 ± 1.0
+5432344

Notes.

^(a)

Total exposure time.

^(b)

Distance based on Gaia Early Data Release 3 (Bailer-Jones et al. 2021).

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