An Intensive HST/COS Study of 31 CV WDs

Date Issued
2015
Author(s)
Pala, A. F.
•
Gänsicke, B. T.
•
Beuermann, K.
•
Bildsten, L.
•
•
Godon, P.
•
Henden, A. A.
•
Hubeny, I.
•
Knigge, C.
•
Long, K. S.
•
Marsh, T. R.
•
Patterson, J.
•
Schreiber, M. R.
•
Sion, E. M.
•
Szkody, P.
•
Townsley, D.
•
Zorotovic, M.
Abstract
Accretion is the key ingredient in the evolution of white dwarfs (WDs) in cataclysmic variables (CVs), with important implications for their potential as progenitors for Type Ia Supernovae. The effective temperature (Teff) gives a direct measure of the average accretion rate and we report here the Teff measurement for 31 CV WDs, observed as a part of a 122 orbit HST program. The HST spectra alone cannot resolve the degeneracy between Teff and the surface gravity log g, and we will use phase-resolved X-Shooter observations to (i) measure the mass ratio of the CVs from the reflex motion of both the WD and the donor star (ii) to establish the spectral energy distribution (SED), which constrains both Teff and log g. Combining the X-Shooter and HST data, we can measure the WD masses to a few percent, and will be able to answer the question whether accreting CV WDs grow in mass.
Coverage
19th European Workshop on White Dwarfs
All editors
Dufour, Patrick; Bergeron, Pierre; Fontaine, Gilles
Series
Volume
493
Start page
521
Conferenece
19th European Workshop on White Dwarfs
Uri
Url
Issn Identifier
1050-3390
Ads BibCode
2015ASPC..493..521P
Rights
open.access
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