期刊
ASTROPHYSICAL JOURNAL
卷 833, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/833/2/146
关键词
accretion, accretion disks; binaries: close; novae cataclysmic variables; stars: individual (BB Doradus); ultraviolet: stars; white dwarfs
资金
- Space Telescope Science Institute [12870]
- NASA [NAS 5-26555]
- European Research Council under the European Union's Seventh Framework Programme (FP)/ERC [320964]
- ASI INAF [I/037/12/0]
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-circle dot (log(g) = 8.4). The disk, with a mass accretion rate of approximate to 10(-10) M-circle dot yr(-1), contributes about 1/5 to 1/2 of the FUV flux.
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