Hubble Space Telescope And Ground-Based Observations Of V455 Andromedae Post-Outburst

dc.contributor.utaustinauthorFalcon, Ross E.en_US
dc.creatorSzkody, Paulaen_US
dc.creatorMukadam, Anjum S.en_US
dc.creatorGansicke, Boris T.en_US
dc.creatorHenden, Arneen_US
dc.creatorSion, Edward M.en_US
dc.creatorTownsley, Dean M.en_US
dc.creatorChristian, Damianen_US
dc.creatorFalcon, Ross E.en_US
dc.creatorPyrzas, Stylianosen_US
dc.creatorBrown, Justinen_US
dc.creatorFunkhouser, Kelseyen_US
dc.description.abstractHubble Space Telescope spectra obtained in 2010 and 2011, 3 and 4 yr after the large amplitude dwarf nova outburst of V455 And, were combined with optical photometry and spectra to study the cooling of the white dwarf, its spin, and possible pulsation periods after the outburst. The modeling of the ultraviolet (UV) spectra shows that the white dwarf temperature remains similar to 600 K hotter than its quiescent value at 3 yr post-outburst, and still a few hundred degrees hotter at 4 yr post-outburst. The white dwarf spin at 67.6 s and its second harmonic at 33.8 s are visible in the optical within a month of outburst and are obvious in the later UV observations in the shortest wavelength continuum and the UV emission lines, indicating an origin in high-temperature regions near the accretion curtains. The UV light curves folded on the spin period show a double-humped modulation consistent with two-pole accretion. The optical photometry 2 yr after outburst shows a group of frequencies present at shorter periods (250-263 s) than the periods ascribed to pulsation at quiescence, and these gradually shift toward the quiescent frequencies (300-360 s) as time progresses past outburst. The most surprising result is that the frequencies near this period in the UV data are only prominent in the emission lines, not the UV continuum, implying an origin away from the white dwarf photosphere. Thus, the connection of this group of periods with non-radial pulsations of the white dwarf remains elusive.en_US
dc.description.sponsorshipNASA from the Space Telescope Science Institute HST-GO1163.01A, HST-GO11639-01A, HST-GO12231.01Aen_US
dc.description.sponsorshipNASA NAS 5-26555en_US
dc.description.sponsorshipNSF AST-1008734en_US
dc.description.sponsorshipEuropean Research Council under the European Union's Seventh Framework Programme (FP)/ERC 267697en_US
dc.description.sponsorshipUK's Science and Technology Facilities Council ST/1001719/1en_US
dc.identifier.citationSzkody, Paula, Anjum S. Mukadam, T. G. Boris, Arne Henden, Edward M. Sion, Dean M. Townsley, Damian Christian et al. "Hubble Space Telescope and ground-based observations of V455 Andromedae post-outburst." The Astrophysical Journal, Vol. 775, No. 1 (Sep., 2013): 66.en_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectbinaries: closeen_US
dc.subjectnovae, cataclysmic variablesen_US
dc.subjectstars: individual (v455en_US
dc.subjectand, hs 2331+3905)en_US
dc.subjectstars: oscillationsen_US
dc.subjectaccreting white-dwarfen_US
dc.subjectzz ceti starsen_US
dc.subjectcataclysmic variablesen_US
dc.subjectgw libraeen_US
dc.subjectsdss j074531.92+453829.6en_US
dc.subjecteffective temperaturesen_US
dc.subjectoptical observationsen_US
dc.subjectinstability stripen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHubble Space Telescope And Ground-Based Observations Of V455 Andromedae Post-Outbursten_US
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