2006 WHOLE EARTH TELESCOPE OBSERVATIONS OF GD358: A NEW LOOK AT THE PROTOTYPE DBV
文献类型：期刊论文
| 作者 | Provencal, J. L.1,2; Montgomery, M. H.2,3; Kanaan, A.4; Shipman, H. L.1; Childers, D.5; Baran, A.6; Kepler, S. O.7; Reed, M.8,9; Zhou, A.8,9; Eggen, J.8,9 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2009-03-01 |
| 卷号 | 693期号:1页码:564-585 |
| 关键词 | stars: evolution stars: individual (GD358) stars: oscillations white dwarfs |
| 英文摘要 | We report on the analysis of 436.1 hr of nearly continuous high-speed photometry on the pulsating DB white dwarf GD358 acquired with the Whole Earth Telescope (WET) during the 2006 international observing run, designated XCOV25. The Fourier transform (FT) of the light curve contains power between 1000 and 4000 mu Hz, with the dominant peak at 1234 mu Hz. We find 27 independent frequencies distributed in 10 modes, as well as numerous combination frequencies. Our discussion focuses on a new asteroseismological analysis of GD358, incorporating the 2006 data set and drawing on 24 years of archival observations. Our results reveal that, while the general frequency locations of the identified modes are consistent throughout the years, the multiplet structure is complex and cannot be interpreted simply as l = 1 modes in the limit of slow rotation. The high-k multiplets exhibit significant variability in structure, amplitude and frequency. Any identification of the m components for the high-k multiplets is highly suspect. The k = 9 and 8 modes typically do show triplet structure more consistent with theoretical expectations. The frequencies and amplitudes exhibit some variability, but much less than the high-k modes. Analysis of the k = 9 and 8 multiplet splittings from 1990 to 2008 reveal a long-term change in multiplet splittings coinciding with the 1996 sforzando event, where GD358 dramatically altered its pulsation characteristics on a timescale of hours. We explore potential implications, including the possible connections between convection and/or magnetic fields and pulsations. We suggest future investigations, including theoretical investigations of the relationship between magnetic fields, pulsation, growth rates, and convection. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000263903300047 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8071]  |
| 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.Delaware Cty Community Coll, Dept Math & Sci, Media, PA 19063 USA 6.Cracow Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland 7.Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil 8.Missouri State Univ, Springfield, MO 65897 USA 9.Baker Observ, Springfield, MO 65897 USA 10.Southwestern Univ, Georgetown, TX USA |
| 推荐引用方式 GB/T 7714 | Provencal, J. L.,Montgomery, M. H.,Kanaan, A.,et al. 2006 WHOLE EARTH TELESCOPE OBSERVATIONS OF GD358: A NEW LOOK AT THE PROTOTYPE DBV[J]. ASTROPHYSICAL JOURNAL,2009,693(1):564-585. |
| APA | Provencal, J. L..,Montgomery, M. H..,Kanaan, A..,Shipman, H. L..,Childers, D..,...&Dalessio, J..(2009).2006 WHOLE EARTH TELESCOPE OBSERVATIONS OF GD358: A NEW LOOK AT THE PROTOTYPE DBV.ASTROPHYSICAL JOURNAL,693(1),564-585. |
| MLA | Provencal, J. L.,et al."2006 WHOLE EARTH TELESCOPE OBSERVATIONS OF GD358: A NEW LOOK AT THE PROTOTYPE DBV".ASTROPHYSICAL JOURNAL 693.1(2009):564-585. |
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来源：国家天文台
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