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Table 1

Summary of parameters related to 4U 1907+09 and Vela X-1.

HMXB Spectral type d (kpc) v(km   s-1)    (10-6   M   yr-1) vw   (km   s-1) Robs (pc) n   (cm-3)

4U 1907+09 O9.5 Iaba 4 160 6b 1690b 0.8 2
Vela X-1 B0.5 Iabc 1.9 50 2d 1100e 0.5 10



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Cox et al. (2005).


Conti (1978).


Watanabe et al. (2006).


Prinja et al. (1990).

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