GW Librae: A Unique Laboratory for Pulsations in an Accreting White Dwarf

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dc.rights.license Attribution-NonCommercial-ShareAlike 1.0 Generic (CC BY-NC-SA 1.0) en_US
dc.contributor.author Castillo, Odette Toloza
dc.contributor.author Gänsicke, Boris T.
dc.contributor.author Hermes, J.J.
dc.contributor.author Townsley, Dean M.
dc.contributor.author Schreiber, Matthias R.
dc.date 2015
dc.date.accessioned 2018-08-22T18:28:25Z
dc.date.available 2018-08-22T18:28:25Z
dc.date.issued 2015
dc.identifier.citation Castillo, O., Gänsicke, B., Hermes, J., Townsley, D., Schreiber, M. (2011): GW Librae: A Unique Laboratory for Pulsations in an Accreting White Dwarf, The Golden Age of Cataclysmic Variables and Related Objects - III (Golden 2015), vol. 255. https://doi.org/10.22323/1.255.0033 en_US
dc.identifier.uri http://ir.ua.edu/handle/123456789/3735
dc.description.abstract Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmospheres with mixed compositions of hydrogen, helium, and metals, and the response of these modes to changes in the white dwarf temperature. Among all pulsating cataclysmic variable white dwarfs, GW Librae stands out by having a well-established observational record of three independent pulsation modes that disappeared when the white dwarf temperature rose dramatically following its 2007 outburst. Our analysis of HST/COS ultraviolet spectroscopy taken in 2002, 2010 and 2011 showed that pulsations produce variations in the white dwarf effective temperature, as predicted by theory. Additionally, in May 2013 we obtained new HST ultraviolet observations that displayed unexpected behaviour: besides variability at '275 s, which is close to the post-outburst pulsations detected with HST in 2010 and 2011, also the white dwarf exhibits high-amplitude variability on a '4.4 h time-scale. We demonstrate that this variability is related to an increase of the photospheric temperature, argue against a short-lived accretion episode as the explanation, and discuss this event in the context of non-radial pulsations on a rapidly rotating star. en_US
dc.format.mimetype application/pdf en_US
dc.rights.uri https://creativecommons.org/licenses/by-nc-sa/1.0/
dc.subject White dwarfs en_US
dc.title GW Librae: A Unique Laboratory for Pulsations in an Accreting White Dwarf en_US
dc.type text en_US


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