Disc-loss episode in the Be shell optical counterpart to the high-mass X-ray binary IGR J21343+4738

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Table 2

Log of the spectroscopic observations around the Hα line and results from the spectral analysis.

Date	JD	Telescope	Wavelength	EW(Hα)	log (V/R)	F_V/F_cd	F_R/F_cd	Velocity^c
	(2 400 000+)		coverage (Å)	(Å)				shift (km s^-1)


2009-Jul.-30	55 043.51	SKO	5290–7365	+1.3 ± 0.3	+0.14 ± 0.10	1.3	1.3	−52 ± 17
2009-Sep.-29	55 104.37	SKO	6070–6980	+0.5 ± 0.3	−0.17 ± 0.12	1.8	1.9	−95 ± 26
2010-Aug.-28	55 437.41	SKO	5305–7380	+0.4 ± 0.2	+0.07 ± 0.06	1.9	1.8	−102 ± 18
2010-Sep.-30^a	55 470.40	SKO	5220–7295	+0.4 ± 0.2	+0.06 ± 0.06	1.6	1.5	−127 ± 43
2011-Aug.-20	55 794.45	SKO	5210–7285	−1.3 ± 0.2	−0.08 ± 0.03	1.8	1.9	−85 ± 16
2011-Sep.-06^b	55 811.30	SKO	6080–6995	−1.8 ± 0.4	−0.12 ± 0.07	2.0	2.1	−117 ± 9
2012-Aug.-24	56 164.41	SKO	5085–7160	−6.9 ± 0.5	+0.36 ± 0.03	2.4	1.7	−62 ± 20
2012-Sep.-06	56 177.46	SKO	5225–7600	−8.1 ± 0.3	+0.34 ± 0.03	2.6	1.9	−61 ± 6
2012-Sep.-13	56 184.40	SKO	5415–7490	−7.1 ± 0.3	+0.39 ± 0.02	1.9	1.4	−36 ± 38
2012-Oct.-15	56 216.81	FLWO	6200–7200	−5.3 ± 0.2	+0.24 ± 0.03	3.1	2.5	−128 ± 16
2012-Oct.-19	56 220.32	SKO	4745–6825	−5.4 ± 0.3	+0.12 ± 0.02	1.9	1.7	−137 ± 24
2012-Dec.-26^a	56 288.36	WHT	6370–7280	−2.4 ± 0.2	−0.73 ± 0.02	2.1	3.3	−131 ± 4
2013-Jan.-04	56 297.57	FLWO	6200–7200	−2.1 ± 0.2	−0.91 ± 0.07	2.7	4.7	−139 ± 19
2013-Jan.-11	56 304.58	FLWO	6200–7200	−1.1 ± 0.2	−0.77 ± 0.09	2.0	3.2	−150 ± 11
2013-Jun.-15	56 459.54	SKO	4950–7030	+2.1 ± 0.3	–	–	–	−148 ± 32
2013-Jul.-05	56 477.86	FLWO	6200–7200	+1.4 ± 0.2	–	–	–	−126 ± 12
2013-Jul.-30	56 505.45	SKO	5400–7480	+1.7 ± 0.2	–	–	–	−69 ± 11
2013-Aug.-23^a	56 528.59	WHT	6350–7235	+1.7 ± 0.1	–	–	–	−105 ± 4

Notes.

^(a)

Average of three spectra.

^(b)

Average of two spectra.

^(c)

Heliocentric scale.

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