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dc.contributor.authorProvençal, Judith L.
dc.contributor.authorMontgomery, Michael H.
dc.contributor.authorKanaan, Antonio
dc.contributor.authorThompson, Susan E.
dc.contributor.authorDalessio, James
dc.contributor.authorShipman, Harry L.
dc.contributor.authorChilders, D.
dc.contributor.authorWood, Matt A.
dc.contributor.authorVennes, Stéphane
dc.contributor.authorNémeth, Péter
dc.date.accessioned2017-01-25T14:21:13Z
dc.date.available2017-01-25T14:21:13Z
dc.date.issued2012-06-01
dc.identifier.citationProvencal, J. L., Montgomery, M. H., Kanaan, A., Thompson, S. E., Dalessio, J., Shipman, H. L., . . . Fraga, L. (2012). Empirical determination of convection parameters in white dwarfs. I. whole earth telescope observations of EC14012-1446. Astrophysical Journal, 751(2) doi:10.1088/0004-637X/751/2/91en_US
dc.identifier.urihttp://hdl.handle.net/11141/1153
dc.description.abstractWe report on an analysis of 308.3 hr of high-speed photometry targeting the pulsating DA white dwarf EC14012-1446. The data were acquired with the Whole Earth Telescope during the 2008 international observing run XCOV26. The Fourier transform of the light curve contains 19 independent frequencies and numerous combination frequencies. The dominant peaks are 1633.907, 1887.404, and 2504.897μHz. Our analysis of the combination amplitudes reveals that the parent frequencies are consistent with modes of spherical degree l = 1. The combination amplitudes also provide m identifications for the largest amplitude parent frequencies. Our seismology analysis, which includes 2004–2007 archival data, confirms these identifications, provides constraints on additional frequencies, and finds an average period spacing of 41 s. Building on this foundation, we present nonlinear fits to high signal-to-noise light curves from the SOAR 4.1 m, McDonald 2.1 m, and KPNO 2 m telescopes. The fits indicate a time-averaged convective response timescale of τ0 = 99.4 ± 17 s, a temperature exponent N = 85±6.2, and an inclination angle of θi = 32.◦9 ± 3.◦2. We present our current empirical map of the convective response timescale across the DA instability strip.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is made available in accordance with the publisher’s policy. It may be subject to U.S. copyright law.en_US
dc.rights.urihttps://aas.org/publications/aas-copyright-policyen_US
dc.titleEmpirical determination of convection parameters in white dwarfs. I. Whole Earth Telescope observations of EC14012-1446en_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0004-637X/751/2/91


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