Hubble COS Spectroscopy of the Dwarf Nova CW Mon: The White Dwarf in Quiescence?

Journal Article · Tue Aug 01 04:00:00 EDT 2017 · The Astronomical Journal (Online)

DOI:https://doi.org/10.3847/1538-3881/AA774C· OSTI ID:22863056

Hause, Connor; Sion, Edward M.; Godon, Patrick ^[1]; Gänsicke, Boris T.; Pala, Anna ^[2]; Szkody, Paula ^[3]

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1. Department of Astrophysics and Planetary Science, Villanova University, 800 Lancaster Avenue, Villanova, PA 19085 (United States)
2. Department of Physics, University of Warwick, Coventry CV4 7AL (United Kingdom)
3. Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195 (United States)

We present a synthetic spectral analysis of the HST COS spectrum of the U Geminorum-type dwarf nova CW Mon, taken during quiescence as part of our COS survey of accreting white dwarfs (WDs) in Cataclysmic Variables. We use a synthetic photosphere and optically thick accretion disk spectra to model the COS spectrum as well as archival IUE spectra obtained decades ago, when the system was in an even deeper quiescent state. Assuming a reddening of E(B−V) = 0.06, an inclination of 60° (CW Mon has eclipses of the accretion disk), and a WD mass of 0.8 M{sub ⊙}, our results indicate the presence of a 22–27,000 K WD and a low mass accretion rate M-dot ≲10{sup −10} M{sub ⊙} yr{sup −1}, for a derived distance of ∼200 to ∼300 pc.

• OSTI ID: 22863056
• Journal Information: The Astronomical Journal (Online), Journal Name: The Astronomical Journal (Online) Journal Issue: 2 Vol. 154; ISSN 1538-3881
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ACCRETION DISKS
DISTANCE
ECLIPSE
INCLINATION
NOVAE
PHOTOSPHERE
SPECTRA
SPECTROSCOPY
WHITE DWARF STARS