Spectroscopy from the Hubble Space Telescope cosmic origins spectrograph of the southern nova-like BB Dorabus in an intermediate state

Journal Article · Tue Dec 20 04:00:00 EST 2016 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/833/2/146· OSTI ID:22868331

Godon, Patrick; Sion, Edward M. ^[1]; Gänsicke, Boris T.; Pala, Anna F.; Toloza, Odette ^[2]; Hubeny, Ivan ^[3]; De Martino, Domitilla ^[4]; Rodríguez-Gil, Pablo ^[5]; Szkody, Paula ^[6]

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1. Department of Astrophysics and Planetary Science, Villanova University, Villanova, PA 19085 (United States)
2. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
3. Steward Observatory, The University of Arizona, Tucson, AZ 85721 (United States)
4. INAF aLS Osservatorio Astronomico di Capodimonte, Napoli, I-80131 (Italy)
5. Instituto de Astrofísica de Canarias, Vía Láctea, s/n, La Laguna, E-38205 Santa Cruz de Tenerife (Spain)
6. Department of Astronomy, University of Washington, Seattle, WA 98195 (United States)

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{sub ⊙}(log(g)=8.4). The disk, with a mass accretion rate of ≈10{sup −10} M{sub ⊙} yr{sup −1}, contributes about 1/5 to 1/2 of the FUV flux.

• OSTI ID: 22868331
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 833; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCRETION DISKS
FAR ULTRAVIOLET RADIATION
INTERMEDIATE STATE
MASS
NOVAE
SPACE
SPECTRA
SPECTROSCOPY
TELESCOPES
WHITE DWARF STARS