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Table 1.

High-mass X-ray binaries and candidates associated with OCs.

HMXB Class Secondary OC Astrometric membership (Hunt & Reffert 2024) OC Age
spectral type probability (Myr)
IGR J16465-4507 sgHMXB B0.5-B1 Ib CWNU 2672 1.0 1.2 – 18 13 + 29 Mathematical equation: $ 18^{+29}_{-13} $
SGR 0755-2933 BeXRB B0Ve HSC 1981 1.0 20 3 + 5 Mathematical equation: $ 20^{+5}_{-3} $
HD 119682 γ Cas B0Ve NGC 5281 0.87 ∼40 – 100
NGC 6649 9 γ Cas B0Ve NGC 6649 1.0 ∼28 – 70

Notes. Column 1: HMXB designation. Column 2: Classification (sgHMXB = supergiant HMXB, BeXRB = Be X-ray binary, γ Cas = gamma Cassiopeiae analog). Column 3: Spectral type of the secondary star. Column 4: OC designation. Column 5: OC membership probability. Column 6: OC age estimates from the literature.

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