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Table 1.

Target list and relevant information.

Source Spectral V-band Pspin Porb e Distance (kpc) References
name type (mag) (s) (days) Gaia DR3
4U 0115+63 B0.2Ve 15.4 3.6 24.3 0.34 5 . 7 0.4 + 0.5 Mathematical equation: $ 5.7^{+0.5}_{-0.4} $ [1a], [1b]
IGR J01363+6610 B1IV-Ve 13.3 5.6 ± 0.4 [2a], [2b]
RX J0146.9+6121 B1Ve 11.3 1400 303? 2.75 ± 0.15 [3a], [3b]
IGR J01583+6713 B2IVe 14.4 5 . 6 0.4 + 0.6 Mathematical equation: $ 5.6^{+0.6}_{-0.4} $ [4a], [4b]
RX J0240.4+6112 B0Ve 10.8 26.5 0.54 2.50 ± 0.07 [5a], [5b]
Swift J0243.6+6124 O9.5Ve 12.8 9.9 27.6 0.10 5 . 2 0.2 + 0.3 Mathematical equation: $ 5.2^{+0.3}_{-0.2} $ [6a], [6b]
V 0332+53 O8–9Ve 15.4 4.4 33.8 0.37 5.9 ± 0.4 [7a], [7b]
RX J0440.9+4431 B0.2Ve 10.7 202.5 150 2 . 44 0.09 + 0.08 Mathematical equation: $ 2.44^{+0.08}_{-0.09} $ [8a], [8b]
1A 0535+262 O9.7IIIe 9.2 105 111 0.47 1.77 ± 0.06 [9a], [9b]
IGR J06074+2205 B0.5Ve 12.2 373.2 80? 6 . 0 0.6 + 0.9 Mathematical equation: $ 6.0^{+0.9}_{-0.6} $ [10a], [10b]
MXB 0656–072 O9.5Ve 12.3 160.4 101.2 0.4? 5.7 ± 0.5 [11a], [11b]
XTE J1946+274 B0-1V-IVe 16.6 15.8 172 0.25 12 . 1 2.2 + 2.6 Mathematical equation: $ 12.1^{+2.6}_{-2.2} $ [12a], [12b]
KS 1947+300 B0Ve 14.5 18.7 40.4 0.03 14 2 + 3 Mathematical equation: $ 14^{+3}_{-2} $ [13a], [13b]
EXO 2030+375 B0Ve 19.5 41.8 46.02 0.41 2 . 4 0.4 + 0.5 Mathematical equation: $ 2.4^{+0.5}_{-0.4} $ [14a], [14b]
GRO J2058+42 O9.5-B0IV-Ve 14.9 192 110 8 . 9 0.8 + 0.7 Mathematical equation: $ 8.9^{+0.7}_{-0.8} $ [15a], [15b]
SAX J2103.5+4545 B0Ve 13.9 358.6 12.7 0.40 6 . 2 0.5 + 0.4 Mathematical equation: $ 6.2^{+0.4}_{-0.5} $ [16a], [16b]
IGR J21343+4738 B1IVe 14.1 320.3 8 . 5 0.8 + 1.1 Mathematical equation: $ 8.5^{+1.1}_{-0.8} $ [17]
Cep X–4 B1-2Ve 14.3 66.3 7 . 2 0.6 + 0.68 Mathematical equation: $ 7.2^{+0.68}_{-0.6} $ [18]
4U 2206+54 O9.5Ve 9.8 5550 19.2 0.15 3 . 2 0.1 + 0.2 Mathematical equation: $ 3.2^{+0.2}_{-0.1} $ [19a], [19b]
SAX J2239.3+6116 B0Ve 14.4 1247 263 7 . 3 0.5 + 0.7 Mathematical equation: $ 7.3^{+0.7}_{-0.5} $ [20a], [20b]
IGR J22534+6243 B1Ve 15.3 46.7 8 . 9 0.9 + 1.4 Mathematical equation: $ 8.9^{+1.4}_{-0.9} $ [21]

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