EMPIRICAL DETERMINATION OF CONVECTION PARAMETERS IN WHITE DWARFS. I. WHOLE EARTH TELESCOPE OBSERVATIONS OF EC14012-1446
文献类型：期刊论文
| 作者 | Provencal, J. L.1,2; Montgomery, M. H.2,3; Kanaan, A.4; Thompson, S. E.1,2,5; Dalessio, J.1,2; Shipman, H. L.1,2; Childers, D.2,6; Clemens, J. C.7; Rosen, R.8; Henrique, P.4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-06-01 |
| 卷号 | 751期号:2 |
| 关键词 | asteroseismology stars: evolution stars: individual (EC14012-1446) stars: oscillations white dwarfs |
| 英文摘要 | We 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000304204600012 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6154]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA 2.Mt Cuba Observ, Delaware Asteroseism Res Ctr, Greenville, DE 19807 USA 3.Univ Texas Austin, Dept Astron, Austin, TX 78712 USA 4.Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil 5.NASA, Ames Res Ctr, SETI Inst, Moffett Field, CA 94035 USA 6.Delaware Cty Community Coll, Dept Math & Sci, Media, PA 19063 USA 7.Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA 8.NRAO, Green Bank, WV 24944 USA 9.Georgia Coll & State Univ, Dept Chem & Phys, Milledgeville, GA 31061 USA 10.Meyer Observ, Waco, TX 76705 USA |
| 推荐引用方式 GB/T 7714 | Provencal, J. L.,Montgomery, M. H.,Kanaan, A.,et al. EMPIRICAL DETERMINATION OF CONVECTION PARAMETERS IN WHITE DWARFS. I. WHOLE EARTH TELESCOPE OBSERVATIONS OF EC14012-1446[J]. ASTROPHYSICAL JOURNAL,2012,751(2). |
| APA | Provencal, J. L..,Montgomery, M. H..,Kanaan, A..,Thompson, S. E..,Dalessio, J..,...&Fraga, L..(2012).EMPIRICAL DETERMINATION OF CONVECTION PARAMETERS IN WHITE DWARFS. I. WHOLE EARTH TELESCOPE OBSERVATIONS OF EC14012-1446.ASTROPHYSICAL JOURNAL,751(2). |
| MLA | Provencal, J. L.,et al."EMPIRICAL DETERMINATION OF CONVECTION PARAMETERS IN WHITE DWARFS. I. WHOLE EARTH TELESCOPE OBSERVATIONS OF EC14012-1446".ASTROPHYSICAL JOURNAL 751.2(2012). |
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来源：国家天文台
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