FUSE Observational Evidence of the Boundary Layer of MY Lyrae in the High State

Abstract

We carry out a spectral analysis of the archival FUSE spectrum of the VY Scl nova-like cataclysmic variable MV Lyrae obtained in the high state. We find that standard disk models fail to fit the flux in the shorter wavelengths of FUSE (< 950$A). An improved fit is obtained by including a modeling of the boundary layer at the inner edge of the disk. The result of the modeling shows that in the high state the disk has a moderate accretion rate of about 2.E09 solar mass per year, a low inclination, a boundary layer with a temperature of around 100,000K, and size 0.20Rwd, and the white dwarf is possibly heated up to a temperature of 50,000K or higher.