# FUSE Observations of the Dwarf Novae UU Aql, BV Cen, and CH UMa in Quiescence

## TL;DR

This study uses FUSE and IUE spectra to analyze the far-ultraviolet flux of three dwarf novae in quiescence, applying synthetic spectral models to understand their white dwarf and accretion disk contributions.

## Contribution

It introduces combined FUSE and IUE spectral analysis with multi-component models to characterize the UV emission sources in dwarf novae during quiescence.

## Key findings

- White dwarf and accretion disk contributions vary among the systems.
- Combined spectral analysis constrains the temperature and flux distribution.
- Model fits provide insights into the accretion states during quiescence.

## Abstract

We report on FUSE spectra of three U Gem-type, long period, dwarf novae, UU Aql, BV Cen and CH UMa taken during their quiescence intervals. We discuss the line identifications in their spectra and attempt to characterize the source(s) of their FUV flux distribution. Archival IUE spectrum of CH UMa and BV Cen in quiescence were identified as having a matching flux level with the FUSE spectra and these were combined with each FUSE spectrum to broaden the wavelength coverage and further constrain model fits. Multi-component synthetic spectral fits from our model grids, consisting of single temperature white dwarfs, two-temperature white dwarfs, accretion disks and white dwarfs plus accretion disks, were applied to the FUSE spectra alone and to the combined FUSE + IUE spectra. We present the results of our model analyses and their implications.