Abstract
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 spectroscopic3–5 and photometric6 studies which revealed periodic optical variations in phase with the X-ray period. Here we report that the ultraviolet spectra taken with the International Ultraviolet Explorer satellite also vary in phase with the X-ray emission. In an interval of ∼200 Å centred on the subordinate He II line at 1,640 Å, emission lines 2–3 Å wide appear and disappear, with maximum flux at binary phase 0.5 (when the neutron star is in front of the O supergiant) and minimum at phase 0.8. We suggest that these variable lines are due to Raman scattering of extreme ultraviolet photons from the X-ray source by He II ions. These Raman lines can thus be used to reconstruct a part of the unobserved extreme ultraviolet spectrum in the He II scattering zone.
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References
Walborn, N. R. Astr. J. 78, 1067–1073 (1973).
Jones, C. et al. Astrophys. J. 181, L43–L48 (1973).
Conti, P. S. & Cowley, A. P. Astrophys. J. 200, 133–144 (1975).
Hammerschlag-Hensberge, G. Astr. Astrophys. 64, 399–405 (1978).
Fahlman, G. G. & Walker, G. A. H. Astrophys. J. 240, 169–179 (1980).
Van Paradijs, J., Hammerschlag-Hensberge, G. & Zuiderwijk, E. J. Astr. Astrophys. Suppl. Ser. 31, 189–198 (1978).
Dupree, A. K. et al. Nature 275, 400–403 (1978).
Hammerschlag-Hensberge, G., Howarth, I. D. & Kallman, T. R. Astrophys. J. 352, 698–708 (1990).
Howarth, I. D. & Prinja, R. K. Astrophys. J. Suppl. Ser. 69, 527–592 (1989).
Branduardi, G., Mason, K. O. & Sanford, P. W. Mon. Not. R. astr. Soc. 185, 137–142 (1978).
Haberl, F., White, N. E. & Kallman, T. R. Astrophys. J. 343, 409–425 (1989).
Gottwald, M., White, N. E. & Stella, L. Mon. Not. R. astr. Soc. 222, 21p–25p (1986).
White, N. E., Kallman, T. R. & Swank, J. H. Astrophys. J. 269, 264–272 (1983).
Mason, K. O., Branduardi, G. & Sanford, P. W. Astrophys. J. 203, L29–L33 (1976).
Giddings, J. R. ESA IUE Newsletter 17, 53–59 (1983).
Avni, Y. Astrophys. J. 210, 642–646 (1976).
Nussbaumer, H., Schmid, H. M. & Vogel, M. Astr. Astrophys. 211, L27–L30 (1989).
Behring, W. E., Cohen, L., Feldman, U. & Doschek, G. A. Astrophys. J. 203, 521–527 (1976).
Dere, K. P. Astrophys. J. 221, 1062–1067 (1978).
MacFarlane, J. J. & Cassinelli, J. P. Astrophys. J. 347, 1090–1099 (1989).
Mewe, R., Gronenschild, E. H. B. M. & Van den Oord, G. H. J. Astr. Astrophys. Suppl. Ser. 62, 197–254 (1985).
Raymond, J. C. & Smith, B. W. Astrophys. J. Suppl. Ser. 35, 419–439 (1977).
Kelly, R. L. J. Phys. Chem. Ref. Data. 16, Suppl. 1 (1987).
Blondin, J. M., Kallman, T. R., Fryxell, B. A. & Taam, R. E. Astrophys. J. (in the press).
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Kaper, L., Hammerschlag–Hensberge, G. & Takens, R. Raman scattering as a diagnostic tool in the massive X-ray binary 4U1700 – 37. Nature 347, 652–655 (1990). https://doi.org/10.1038/347652a0
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DOI: https://doi.org/10.1038/347652a0
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