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Table A.1.

X-ray observations of Cyg OB2 #8A.

Facility Date (mid-obs) Count rate Exposure Observation ID/Rev Phase (a)
(MJD) (count s−1) (ks)
XMM-Newton(b) 3308.080 0.514 ± 0.005 20.909 0200450201/0896 0.586
3318.059 0.392 ± 0.004 22.982 0200450301/0901 0.042
3328.043 0.485 ± 0.004 25.056 0200450401/0906 0.497
3338.005 0.441 ± 0.004 22.982 0200450501/0911 0.952
4219.854 0.424 ± 0.004 31.795 0505110301/1353 0.207
4223.669 0.475 ± 0.004 33.005 0505110401/1355 0.381
5737.756 0.470 ± 0.004 29.722 0677980601/2114 0.497
6757.709 0.191 ± 0.004 10.368 0740300101/2625 0.056
7682.729 0.179 ± 0.004 13.119 0780040101/3089 0.282
7698.880 0.093 ± 0.002 34.668 0793183001/3097 0.019
7856.333 0.236 ± 0.005 8.727 0800150101/3176 0.206
8092.351 0.063 ± 0.002 22.640 0801910601/3294 0.956
Swift 4084.709 0.161 ± 0.006 4.486 36257003 0.038
5571.120 0.279 ± 0.009 3.170 31904001 0.890
5655.338 0.245 ± 0.009 3.349 31904002 0.734
5699.583 0.271 ± 0.009 3.592 31904003 0.754
5743.339 0.245 ± 0.008 4.159 31904004 0.752
5841.670 0.205 ± 0.008 3.469 31904005 0.240
6379.940 0.278 ± 0.012 1.832 32767001 0.811
6380.377 0.278 ± 0.011 2.504 32767002 0.831
7191.028 0.286 ± 0.029 0.350 33818001 0.836
7191.549 0.165 ± 0.048 0.073 33818002 0.860
7192.237 0.258 ± 0.023 0.504 33818003 0.891
7192.816 0.217 ± 0.030 0.244 33818005 0.918
7193.012 0.312 ± 0.061 0.083 33818004 0.927
7193.760 0.206 ± 0.018 0.662 33818006 0.961
7194.031 0.185 ± 0.018 0.568 33818007 0.973
7194.818 0.171 ± 0.015 0.736 33818008 0.009
7195.283 0.167 ± 0.012 1.131 33818009 0.030
7195.659 0.157 ± 0.015 0.707 33818010 0.048
7196.160 0.186 ± 0.017 0.672 33818011 0.070
7196.613 0.144 ± 0.019 0.415 33818012 0.091
7197.416 0.157 ± 0.013 0.878 33818013 0.128
7197.937 0.175 ± 0.025 0.269 33818014 0.152
7198.551 0.177 ± 0.019 0.492 33818016 0.180
7199.011 0.173 ± 0.025 0.284 33818017 0.201
7199.798 0.219 ± 0.020 0.535 33818018 0.237
7200.732 0.199 ± 0.016 0.814 33818020 0.279
7201.080 0.217 ± 0.018 0.669 33818021 0.295
7201.529 0.198 ± 0.015 0.842 33818022 0.316
7202.034 0.207 ± 0.023 0.401 33818023 0.339
7203.010 0.246 ± 0.023 0.455 33818024 0.383
7203.657 0.199 ± 0.022 0.402 33818025 0.413
7204.390 0.215 ± 0.017 0.754 33818026 0.446
7204.590 0.219 ± 0.016 0.863 33818027 0.455
7205.255 0.208 ± 0.017 0.716 33818028 0.486
7205.600 0.237 ± 0.019 0.683 33818029 0.501
7206.530 0.222 ± 0.017 0.751 33818031 0.544
7207.251 0.218 ± 0.018 0.660 33818032 0.577
7207.596 0.237 ± 0.017 0.780 33818033 0.592
7208.861 0.208 ± 0.015 0.879 33818035 0.650
7209.458 0.212 ± 0.016 0.813 33818036 0.677
7210.750 0.218 ± 0.021 0.482 33818038 0.736
7211.454 0.285 ± 0.021 0.663 33818039 0.769
7211.988 0.261 ± 0.018 0.775 33818040 0.793
7212.375 0.238 ± 0.017 0.806 33818041 0.811
7212.708 0.267 ± 0.018 0.786 33818042 0.826
7213.790 0.251 ± 0.018 0.749 33818044 0.875
7213.852 0.222 ± 0.020 0.573 33818043 0.878
7284.444 0.137 ± 0.007 2.772 32767003 0.100
7510.027 0.233 ± 0.008 3.494 34282006 (c) 0.398
7524.601 0.176 ± 0.007 3.329 34282008 (c) 0.063
7540.490 0.258 ± 0.011 2.073 34282010 (c) 0.789
7591.626 0.146 ± 0.005 4.922 34282078 (c) 0.123
7618.558 0.208 ± 0.018 0.662 34282022 0.352
7879.050 0.187 ± 0.016 0.737 93146003 0.243
7907.287 0.226 ± 0.011 1.730 93146005 0.532
7921.106 0.175 ± 0.008 2.934 93146006 (c) 0.163
7935.656 0.283 ± 0.011 2.170 93146007 (c) 0.827
7942.261 0.211 ± 0.007 3.846 34282018 (c) 0.129
7948.354 0.182 ± 0.010 1.973 34282081 (c) 0.407
7951.202 0.191 ± 0.010 1.898 34282084 (c) 0.537
8095.676 0.156 ± 0.008 2.664 10451001 0.132
8105.269 0.202 ± 0.008 2.878 10451002 0.570
8115.631 0.150 ± 0.008 2.619 10451003 0.043
8125.724 0.192 ± 0.008 2.741 10451004 0.503
8135.195 0.219 ± 0.009 2.721 10451005 0.936
8145.287 0.174 ± 0.008 2.691 10451006 0.397
8155.291 0.262 ± 0.010 2.443 10451007 0.853
8166.120 0.198 ± 0.009 2.479 10451008 0.347
8175.705 0.228 ± 0.009 2.882 10451009 0.785
8185.109 0.202 ± 0.010 1.993 10451010 0.214
8229.108 0.206 ± 0.022 0.432 34282137 0.223
8355.695 0.151 ± 0.010 1.533 88806001 0.001
8357.961 0.172 ± 0.011 1.380 88807001 0.105
NuTAR(d) 8356.290 0.047 ± 0.031 40.919 30410001002 0.028
8357.527 0.074 ± 0.051 50.030 30410002002 0.085

Notes.

(a)

Phases were computed with the orbital solution revised in Sect. 3.

(b)

The count rates are in the 2−10 keV energy band for EPIC/pn except for MJD 8092.351 because Cyg OB2 #8A was observed with a large off-axis angle and EPIC/pn was in timing mode making only MOS2 data exploitable.

(c)

The count rates of these observations were taken from the Swift light curve repository.

(d)

The count rates are for FPMA.

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