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Raman scattering as a diagnostic tool in the massive X-ray binary 4U1700 - 37

Hammerschlag-Hensberge, G.; Kaper, L.; Takens, R. J.

HD153919, an extreme Of star (spectral type O6.5Iaf⁺; ref. 1) has been identified as the optical counterpart of the 3.411-day eclipsing massive X-ray binary 4U1700 - 37 (ref. 2) by spectroscopic^3-5 and photometric⁶ studies which revealed periodic optical variations in phase with the X-ray period. Here we report tha…