TY - JOUR
T1 - SPECTROSCOPY from the H UBBLE SPACE TELESCOPE COSMIC ORIGINS SPECTROGRAPH of the SOUTHERN NOVA-LIKE BB DORADUS in AN INTERMEDIATE STATE
AU - Godon, Patrick
AU - Sion, Edward M.
AU - Gänsicke, Boris T.
AU - Hubeny, Ivan
AU - De Martino, Domitilla
AU - Pala, Anna F.
AU - Rodríguez-Gil, Pablo
AU - Szkody, Paula
AU - Toloza, Odette
N1 - Funding Information:
P.G. wishes to thank Bill Blair for his kind hospitality at the Rowland Department of Physics and Astronomy in the Johns Hopkins University, Baltimore, Maryland. Special thanks to the Austral Variable Star Observer Network (AVSON), and the American Association of Variable Star Observers (AAVSO) for their monitoring of BB Dor. This research is part of the GO program 12870 based on observations made with the NASA/ESA Hubble Space Telescope, obtained at and funded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy Inc., under NASA contract NAS 5-26555. The research leading to these results has received funding from the European Research Council under the European Unions Seventh Framework Programme (FP/20072013)/ERC Grant Agreement n.320964 (WDTracer). D.d.M. acknowledges financial support from ASI INAF contract I/037/12/0.
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/12/20
Y1 - 2016/12/20
N2 - 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 MȮ(log(g)=8.4). The disk, with a mass accretion rate of ≈10-10 MȮ, contributes about 1/5 to 1/2 of the FUV flux.
AB - 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 MȮ(log(g)=8.4). The disk, with a mass accretion rate of ≈10-10 MȮ, contributes about 1/5 to 1/2 of the FUV flux.
KW - accretion, accretion disks
KW - binaries: close
KW - novae, cataclysmic variables
KW - stars: individual (BB Doradus)
KW - ultraviolet: stars
KW - white dwarfs
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U2 - 10.3847/1538-4357/833/2/146
DO - 10.3847/1538-4357/833/2/146
M3 - Article
AN - SCOPUS:85007575687
SN - 0004-637X
VL - 833
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 146
ER -