Empirical Determination Of Convection Parameters In White Dwarfs. I. Whole Earth Telescope Observations Of EC14012-1446

dc.contributor.utaustinauthorMontgomery, Michael H.en_US
dc.contributor.utaustinauthorWang, S.en_US
dc.creatorProvencal, J. L.en_US
dc.creatorMontgomery, Michael H.en_US
dc.creatorKanaan, A.en_US
dc.creatorThompson, Susan E.en_US
dc.creatorDalessio, J.en_US
dc.creatorShipman, H. L.en_US
dc.creatorChilders, D.en_US
dc.creatorClemens, J. Christopheren_US
dc.creatorRosen, R.en_US
dc.creatorHenrique, P.en_US
dc.creatorBischoff-Kim, Agnesen_US
dc.creatorStrickland, W.en_US
dc.creatorChandler, Deanen_US
dc.creatorWalter, B.en_US
dc.creatorWatson, T. K.en_US
dc.creatorCastanheira, B.en_US
dc.creatorWang, S.en_US
dc.creatorHandler, G.en_US
dc.creatorWood, M.en_US
dc.creatorVennes, S.en_US
dc.creatorNemeth, P.en_US
dc.creatorKepler, S. O.en_US
dc.creatorReed, M.en_US
dc.creatorNitta, Atsukoen_US
dc.creatorKleinman, S. J.en_US
dc.creatorBrown, T.en_US
dc.creatorKim, S. L.en_US
dc.creatorSullivan, D.en_US
dc.creatorChen, W. P.en_US
dc.creatorYang, M.en_US
dc.creatorShih, C. Y.en_US
dc.creatorJiang, X. J.en_US
dc.creatorSergeev, A. V.en_US
dc.creatorMaksim, A.en_US
dc.creatorJanulis, R.en_US
dc.creatorBaliyan, K. S.en_US
dc.creatorVats, H. O.en_US
dc.creatorZola, S.en_US
dc.creatorBaran, A.en_US
dc.creatorWiniarski, M.en_US
dc.creatorOgloza, W.en_US
dc.creatorPaparo, M.en_US
dc.creatorBognar, Z.en_US
dc.creatorPapics, P.en_US
dc.creatorKilkenny, D.en_US
dc.creatorSefako, R.en_US
dc.creatorBuckley, D.en_US
dc.creatorLoaring, N.en_US
dc.creatorKniazev, A.en_US
dc.creatorSilvotti, R.en_US
dc.creatorGalleti, S.en_US
dc.creatorNagel, T.en_US
dc.creatorVauclair, G.en_US
dc.creatorDolez, N.en_US
dc.creatorFremy, J. R.en_US
dc.creatorPerez, J.en_US
dc.creatorAlmenara, J. M.en_US
dc.creatorFraga, L.en_US
dc.date.accessioned2016-04-28T19:39:37Z
dc.date.available2016-04-28T19:39:37Z
dc.date.issued2012-06en
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 2504.897 mu Hz. 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 tau(0) = 99.4 +/- 17 s, a temperature exponent N = 85 +/- 6.2, and an inclination angle of theta(i) = 32 degrees.9 +/- 3 degrees.2. We present our current empirical map of the convective response timescale across the DA instability strip.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipCrystal Trust Foundationen_US
dc.description.sponsorshipMt. Cuba Observatoryen_US
dc.description.sponsorshipUniversity of Delawareen_US
dc.description.sponsorshipNSF AST-0909107en_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-0252-2009en_US
dc.description.sponsorshipKASI (Korea Astronomy and Space Science Institute) 2012-1-410-02en_US
dc.description.sponsorshipAustrian Fonds zur Forderung der wissenschaftlichen Forschung P18339-N08en_US
dc.identifierdoi:10.15781/T20F9Z
dc.identifier.Filename2012_06_ec14012-1446.pdfen_US
dc.identifier.citationProvencal, Judith L., Michael Houston Montgomery, A. Kanaan, S. E. Thompson, J. Dalessio, Harry L. Shipman, D. Childers et al. "Empirical Determination of Convection Parameters in White Dwarfs. I. Whole Earth Telescope Observations of EC14012-1446." The Astrophysical Journal, Vol. 751, No. 2 (Jun., 2012): 91.en_US
dc.identifier.doi10.1088/0004-637x/751/2/91en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/35051
dc.language.isoEnglishen_US
dc.relation.ispartofen_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.rights.restrictionOpenen_US
dc.subjectasteroseismologyen_US
dc.subjectstars: evolutionen_US
dc.subjectstars: individual (ec14012-1446)en_US
dc.subjectstars: oscillationsen_US
dc.subjectwhite dwarfsen_US
dc.subjectzz-ceti starsen_US
dc.subjectdigital-sky-surveyen_US
dc.subjectlight curvesen_US
dc.subjectevolutionary modelsen_US
dc.subjectgravity modesen_US
dc.subjectasteroseismologyen_US
dc.subjectpulsationsen_US
dc.subjectdbven_US
dc.subjectidentificationen_US
dc.subjectsimulationsen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleEmpirical Determination Of Convection Parameters In White Dwarfs. I. Whole Earth Telescope Observations Of EC14012-1446en_US
dc.typeArticleen_US

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