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Table 1
List of targets.
| X-ray | Optical | RA | Dec | Spectral | E(B − V) | Distance | disk- | X-ray |
| name | name | (eq. 2000) | (eq. 2000) | type | (mag) | (kpc) | loss | outburst |
|
|
||||||||
| 2S 0114+65 | V662 Cas | 01 18 02.7 | +65 17 30 | B1Ia | 1.33 ± 0.04 | 5.9 ± 1.4 | – | – |
| 4U 0115+63 | V635 Cas | 01 18 31.8 | +63 44 33 | B0.2Ve | 1.71 ± 0.05 | 6.0 ± 1.5 | yes | II |
| IGR J01363+6610 | – | 01 35 49.5 | +66 12 43 | B1Ve | 1.61 ± 0.03 | 2.2 ± 0.5 | no | – |
| IGR J01583+6713 | – | 01 58 18.4 | +67 13 23 | B2IVe | 1.44 ± 0.04 | 3.4 ± 0.8 | no | – |
| RX J0146.9+6121 | LS I +61 235 | 01 47 00.2 | +61 21 24 | B1Ve | 0.88 ± 0.03 | 2.5 ± 0.6 | no | – |
| RX J0240.4+6112 | LS I +61 303 | 02 40 31.7 | +61 13 46 | B0.5Ve | 1.09 ± 0.03 | 1.6 ± 0.4 | no | – |
| V 0332+53 | BQ Cam | 03 34 59.9 | +53 10 23 | O8.5Ve | 1.94 ± 0.03 | 6.0 ± 1.5 | no | II |
| RX J0440.9+4431 | LS V +44 17 | 04 40 59.3 | +44 31 49 | B0.2Ve | 0.91 ± 0.03 | 2.2 ± 0.5 | yes | I |
| 1A 0535+262 | V725 Tau | 05 38 54.6 | +26 18 57 | O9.7IIIe | 0.77 ± 0.04 | 2.1 ± 0.5 | no | I,II |
| IGR J06074+2205 | – | 06 07 26.6 | +22 05 48 | B0.5Ve | 0.86 ± 0.03 | 4.1 ± 1.0 | yes | – |
| AX J1845.0-0433 | – | 18 45 01.5 | –04 33 58 | O9Ia | 2.42 ± 0.07 | 5.5 ± 1.5 | – | flare |
| 4U 1907+09 | – | 19 09 37.9 | +09 49 49 | O9.5Iab | 3.31 ± 0.10 | 4.4 ± 1.2 | – | |
| XTE J1946+274 | – | 19 45 39.4 | +27 21 56 | B0–1IV-Ve | 1.18 ± 0.04 | 7.0 ± 2.0 | no | I,II |
| KS 1947+300 | – | 19 49 35.5 | +30 12 32 | B0Ve | 2.01 ± 0.05 | 8.0 ± 2.0 | no | I,II |
| EXO 2030+375 | – | 20 32 15.3 | +37 38 15 | B0Ve | 3.00 ± 0.20 | 6.5 ± 2.5 | no | I,II |
| GRO J2058+42 | – | 20 58 47.5 | +41 46 37 | O9.5–B0IV-Ve | 1.37 ± 0.03 | 9.0 ± 2.5 | no | – |
| SAX J2103.5+4545 | – | 21 03 35.7 | +45 45 06 | B0Ve | 1.36 ± 0.03 | 6.0 ± 1.5 | yes | I |
| IGR J21343+4738 | – | 21 34 20.4 | +47 38 00 | B1IV shell | 0.75 ± 0.03 | 10.0 ± 2.5 | yes | – |
| 4U 2206+54 | BD+53 2790 | 22 07 56.2 | +54 31 06 | O9.5Ve | 0.51 ± 0.03 | 3.0 ± 0.7 | – | – |
| SAX J2239.3+6116 | – | 22 39 20.9 | +61 16 27 | B0–2III-Ve | 1.66 ± 0.04 | 4.1 ± 1.3 | no | – |
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