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Empirical determination of convection parameters in white dwarfs. I. Whole earth telescope obsevations of EC14012-1446

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Empirical determination of convection parameters in white dwarfs. I. Whole earth telescope obsevations of EC14012-1446

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Título Empirical determination of convection parameters in white dwarfs. I. Whole earth telescope obsevations of EC14012-1446
Autor Provencal, Judith L.
Montgomery, Michael Houston
Kanaan Neto, Antonio Nemer
Thompson, S. E.
Dalessio, J.
Shipman, Harry L.
Childers, D.
Clemens, J. Christopher
Rosen, Rachel
Henrique, P.
Bischoff-Kim, Agnès
Strickland, Willie
Chandler, Dean W.
Walter, B.
Watson, Todd K.
Castanheira, Bárbara Garcia
Wang, Siqiu
Handler, Gerald
Wood, Matthew A.
Vennes, S.
Nemeth, Peter
Kepler, Souza Oliveira
Reed, M. D.
Nitta, Atsuko
Kleinman, Scot James
Brown, Tim
Kim, Seung-Lee
Sullivan, Denis J.
Chen, Wen-Ping
Yang, M.
Shih, Chia-You
Jiang, Xiaojun
Sergeev, A.
Maksim, A.
Janulis, Rimvydas
Baliyan, Kiran S.
Vats, Hari Om
Zola, Staszek
Baran, Andrzej
Winiarski, M.
Ogloza, Waldemar
Paparo, Margit
Baran, Andrzej
Bognár, Zsófia
Papics, P.
Kilkenny, Dave
Sefako, R.
Buckley, David A.H.
Loaring, N.
Kniazev, A.
Silvotti, Roberto
Galleti, S.
Nagel, Thorsten
Vauclair, Gérard
Dolez, Noël
Fremy, J. R.
Gonzalez Perez, Jose Miguel
Almenara, J. M.
Fraga, Luciano
Abstract We report on an analysis of 308.3 hr of high-speed photometry targeting the pulsating DA white dwarf EC14012-1446. The datawere acquiredwith theWhole 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.
Contido em The astrophysical journal. Bristol. Vol. 751, no. 2 (June 2012), 91, 19 p.
Assunto Anãs brancas
Evolucao estelar
Fotometria estelar
Pulsacoes estelares
[en] Asteroseismology
[en] Atars: evolution
[en] Stars: individual (EC14012-1446)
[en] Stars: oscillations
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/109079
Arquivos Descrição Formato
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