Spectroscopy from the Hubble Space Telescope Cosmic Origins Spectrograph of the Southern Nova-like BB Doradus in an Intermediate State
Abstract
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}⊙ ({log}(g)=8.4). The disk, with a mass accretion rate of ≈ {10}-10 {M}⊙ {{yr}}-1, contributes about 1/5 to 1/2 of the FUV flux.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 2016
- DOI:
- 10.3847/1538-4357/833/2/146
- arXiv:
- arXiv:1701.05222
- Bibcode:
- 2016ApJ...833..146G
- Keywords:
-
- accretion;
- accretion disks;
- binaries: close;
- novae;
- cataclysmic variables;
- stars: individual: BB Doradus;
- ultraviolet: stars;
- white dwarfs;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- The Astrophysical Journal, Volume 833, page 146 (2016)