Spectrum variations of the X-ray binary HD 153919 = 3U 1700-37

Details Spectrum variations of the X-ray binary HD 153919 = 3U 1700-37 Spectrum variations of the X-ray binary HD 153919 = 3U 1700-37

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217l..35f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 217, Oct. 1, 1977, p. L35-L39. Research supported by the National Re

Other

5

Binary Stars, X Ray Spectra, X Ray Stars, Astronomical Spectroscopy, Neutron Stars, O Stars

Scientific paper

The letter reports some recent spectroscopic observations of the Of star HD 153919, the primary in the 3U 1700-37 X-ray binary system. Two distinct variable components are present in the He I 5876-A P Cygni line and in the strong H-alpha emission line. One component is displaced by 400-600 km/s to the red. It has not been noted previously and may only be a fluctuation in the emission envelope. The other component, with a radial velocity of roughly 800 km/s, appears to be a phase-dependent absorption feature. Some implications of interpreting this feature as absorption by an extended wake trailing the secondary are discussed. In particular, if the radial velocity of the wake feature is identified with the terminal velocity of the stellar wind, then, depending on the mass-loss rate of the primary, the system should emit a flux density at 3 cm in the range between 2-13 mJy.

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