FUSE Observations of the Bright, Eclipsing, Novalike Cataclysmic Variable, UX UMa

Details FUSE Observations of the Bright, Eclipsing, Novalike Cataclysmic Variable, UX UMa FUSE Observations of the Bright, Eclipsing, Novalike Cataclysmic Variable, UX UMa

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.6207f&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #62.07; Bulletin of the American Astronomical Society, Vol. 33, p.1400

Astronomy and Astrophysics

Astronomy

Scientific paper

Using the Far Ultraviolet Spectroscopic Explorer (FUSE), we have obtained FUV (905 -- 1187Å), orbital phase-resolved spectroscopy of the novalike cataclysmic variable UX UMa at high spectral resolution (R ~12,000). UX UMa is the brightest of the eclipsing NLs, and UV studies of UX UMa have contributed much to our understanding of the interaction between the accretion disk, the boundary layer, and bipolar outflows in mass transfer binaries. The time-averaged FUV spectrum of UX UMa is dominated by strong, broad emission lines, with the strongest emission in transitions of CIII, NIII, NIV, SIV, and OVI. During eclipse, the continuum flux at the longer wavelengths drops by a factor of 2.8. The strongest emission lines are uneclipsed, and there is only a weak eclipse at the shortest wavelengths (<950 Å), suggesting that line emission is dominant near the Lyman limit. We will present analysis of the orbital variations in the FUV spectra and compare these to previous models of the outflow in UX UMa which suggest the presence of an asymmetric accretion disk chromosphere and a fast bipolar outflow.

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