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Paper: A Detailed Study of CSS 41177: an Eclipsing Double White Dwarf
Volume: 493, 19th European Workshop on White Dwarfs
Page: 313
Authors: Bours, M. C. P.; Marsh, T. R.; Parsons, S. G.; Copperwheat, C. M.; Dhillon, V. S.; Littlefair, S. P.; Gänsicke, B. T.; Gianninas, A.; Tremblay, P.-E.
Abstract: We present high-speed photometry and spectroscopy (ULTRACAM and X-Shooter), as well as Hubble Space Telescope + Cosmic Origins Spectrograph far-UV spectra of the eclipsing double white dwarf binary CSS 41177. Due to the temperature difference between the two white dwarfs, the HST+COS data are dominated by the hot white dwarf and therefore allow us to measure its temperature (T1), while the X-Shooter data allows us to constrain both radial velocity amplitudes. Combined with the eclipse observations, we are then able to determine all binary and white dwarf parameters. We find that the secondary's temperature and surface gravity (T2 = 10887(32) K, log (g2) = 7.305(11)) put it inside the ZZ Ceti instability strip, although pulsations to 0.5% relative amplitude have been excluded using the ULTRACAM data.
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