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

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

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.347..652k&link_type=abstract

Nature (ISSN 0028-0836), vol. 347, Oct. 18, 1990, p. 652-655.

Physics

17

Raman Spectra, Stellar Mass, Ultraviolet Spectra, X Ray Binaries, Emission Spectra, Iue, Neutron Stars, Supergiant Stars

Scientific paper

UV spectra of the extreme Of star HD153919, which has been identified as the optical counterpart of the 3411-day eclipsing massive X-ray binary 4U1700 - 37, are reported which vary in phase with the X-ray period. In an interval of about 200 A centered on the subordinate He II line at 1640 A, emission lines 2-3 A wide appear and disappear, with maximum flux at binary phase 0.5 and minimum at phase 0.8. It is suggested that these variable lines are due to Raman scattering of extreme UV 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 UV spectrum in the He II scattering zone.

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