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 –
|
| SGR 0755-2933 | BeXRB | B0Ve | HSC 1981 | 1.0 | ![]() |
| 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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