# Hubble Space Telescope Cosmic Origins Spectrograph Spectroscopy of the Southern Nova-like BB Doradus in an Intermediate State

## TL;DR

This study analyzes Hubble Space Telescope spectra of the nova-like variable BB Doradus during an intermediate state, estimating the white dwarf's temperature and accretion disk contribution in the far ultraviolet.

## Contribution

First spectral analysis of BB Doradus during an intermediate state, providing estimates of white dwarf temperature and accretion disk contribution using HST/COS data.

## Key findings

- White dwarf temperature estimated at 35,000-50,000 K.
- Accretion disk contributes 20-50% of far ultraviolet flux.
- White dwarf is a significant far ultraviolet component.

## Abstract

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