IUE observations of CYG X-2 and SCO X-1: Accretion disks and the z-shaped curve

Details IUE observations of CYG X-2 and SCO X-1: Accretion disks and the z-shaped curve IUE observations of CYG X-2 and SCO X-1: Accretion disks and the z-shaped curve

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..671v&link_type=abstract

In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 1: X Ray Binaries p 671-675 (SEE N90-25711 19-89)

Astronomy and Astrophysics

Astronomy

1

Accretion Disks, Color-Color Diagram, Emission Spectra, Iue, Ultraviolet Radiation, X Ray Astronomy, Cygnus Constellation, Japanese Space Program, Scorpius Constellation, Stellar Mass Accretion, Stellar Oscillations, X Ray Binaries, X Ray Spectra

Scientific paper

The IUE results obtained during two multiwave-length campaigns are presented. Simultaneous observations taken with the Japanese X ray satellite Ginga and numerous ground based radio and optical facilities are included. Cyg X-2 and Sco X-1 are low mass X ray binaries. The simultaneous UV/X ray observations show that there is a direct relationship between the strengths of the UV continuum and line fluxes and the placement of the X ray spectrum in one of the spectral branches. The strengths increase monotonically along the Z with the least UV emission in the horizontal branch and the most in the flaring branch. Models predicting UV continuum emission from the X ray heated surface of the companion star and an X ray illuminated accretion disk were developed. The data/model comparison suggests that X ray heating of the accretion disk is the dominant source of UV emission and that the mass accretion rate increases monotonically along the Z.

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