A \widetilde { \chi } ^ { 2 } analysis of standard model accretion disk synthetic spectrum fits to combined FUSE and STIS spectra of V3885 Sagittarius , on an absolute flux basis , selects a model that accurately represents the observed SED .
Calculation of the synthetic spectrum requires the following system parameters .
The cataclysmic variable secondary star period-mass relation calibrated by Knigge in 2007 sets the secondary component mass .
A mean white dwarf ( WD ) mass from the same study , that is consistent with an observationally-determined mass ratio , sets the adopted WD mass of 0.7 M _ { \odot } , and the WD radius follows from standard theoretical models .
The adopted inclination , i = 65 { \arcdeg } , is a literature consensus , and is subsequently supported by \widetilde { \chi } ^ { 2 } analysis .
The mass transfer rate is the remaining parameter to set the accretion disk T _ { eff } profile , and the Hipparcos parallax constrains that parameter to \dot { M } = 5.0 { \pm } 2.0 { \times } 10 ^ { -9 } ~ { } M _ { \odot } ~ { } { yr } ^ { -1 } by a comparison with observed spectra .
The fit to the observed spectra adopts the contribution of a 57 , 000 { \pm } 5000 K WD .
The model thus provides realistic constraints on \dot { M } and T _ { eff } for a large \dot { M } system above the period gap .