SPECTROSCOPY from the H UBBLE SPACE TELESCOPE COSMIC ORIGINS SPECTROGRAPH of the SOUTHERN NOVA-LIKE BB DORADUS in AN INTERMEDIATE STATE

We present a spectral analysis of the spectrum from the Hubble Space Telescope Cosmic Origins Spectrograph (HST/COS) of the southern VY Scl nova-like variable BB Doradus, obtained as part of a Cycle 20 HST/COS survey of accreting white dwarfs (WDs) in cataclysmic variables. BB Dor was observed with COS during an intermediate state with a low mass accretion rate, thereby allowing an estimate of the WD temperature. The results of our spectral analysis show that the WD is a significant far-ultraviolet (FUV) component of the spectrum with a temperature of about 35,000-50,000 K, assuming a WD mass of 0.80 M_Ȯ(log(g)=8.4). The disk, with a mass accretion rate of ≈10^-10 M_Ȯ, contributes about 1/5 to 1/2 of the FUV flux.