Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..278v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 278-288.
Astronomy and Astrophysics
Astronomy
64
Spaceborne Astronomy, Stellar Spectra, Ultraviolet Astronomy, Ultraviolet Spectra, X Ray Binaries, Emission Spectra, Iue, Line Spectra, Red Shift, Spectrum Analysis
Scientific paper
IUE UV results are presented for the low-mass X-ray binary Sco X-1. Models that predict UV continuum emission from the X-ray-heated surface from the companion star and from an X-ray illuminated accretion disk are adjusted for parameters intrinsic to Sco X-1, and fitted to the data. X-ray heating is found to be the dominant source of UV emission; the mass-accretion rate increases monotonically along the 'Z-shaped' curve in an X-ray color-color diagram. UV emission lines from He, C, N, O, and Si were detected; they all increase in intensity from the HB to the FB state. A model in which emission lines are due to outer-disk photoionization by the X-ray source is noted to give good agreement with line fluxes observed in each state.
Hertz Paul
Lewin Walter H. G.
Mitsuda Kazu
Penninx Wim
Raymond John C.
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