The everchanging pulsating white dwarf GD358

	The everchanging pulsating white dwarf GD358
	Kepler, SO ; Nather, RE ; Winget, DE ; Nitta, A ; Kleinman, SJ ; Metcalfe, T ; Sekiguchi, K ; Jiang, XJ; Sullivan, D ; Sullivan, T
刊名	ASTRONOMY & ASTROPHYSICS
	2003-04-01
卷号	401 期号:2 页码:639-654
关键词	stars : white dwarfs stars : variables : general stars : oscillations stars : individual : GD 358 stars : evolution
英文摘要	We report 323 hours of nearly uninterrupted time series photometric observations of the DBV star GD 358 acquired with the Whole Earth Telescope ( WET) during May 23rd to June 8th, 2000. We acquired more than 232 000 independent measurements. We also report on 48 hours of time-series photometric observations in Aug 1996. We detected the non-radial g-modes consistent with degree l = 1 and radial order 8 to 20 and their linear combinations up to 6th order. We also detect, for the first time, a high amplitude l = 2 mode, with a period of 796 s. In the 2000 WET data, the largest amplitude modes are similar to those detected with the WET observations of 1990 and 1994, but the highest combination order previously detected was 4th order. At one point during the 1996 observations, most of the pulsation energy was transferred into the radial order k = 8 mode, which displayed a sinusoidal pulse shape in spite of the large amplitude. The multiplet structure of the individual modes changes from year to year, and during the 2000 observations only the k = 9 mode displays clear normal triplet structure. Even though the pulsation amplitudes change on timescales of days and years, the eigenfrequencies remain essentially the same, showing the stellar structure is not changing on any dynamical timescale.
收录类别	SCI
语种	英语
WOS记录号	WOS:000181708800026
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8422]
专题	国家天文台_光学天文研究部
作者单位	1.UFRGS, Inst Fis, Porto Alegre, RS, Brazil 2.Univ Texas, Dept Astron, Austin, TX 78712 USA 3.Univ Texas, McDonald Observ, Austin, TX 78712 USA 4.Apache Pt Observ, Sloan Digital Sky Survey, Sunspot, NM 88349 USA 5.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA 6.Acad Sinica, Beijing Astron Observ, Beijing 100080, Peoples R China 7.Victoria Univ Wellington, Wellington, New Zealand 8.Inst Theoret Phys & Astron, LT-2600 Vilnius, Lithuania 9.Cracow Pedag Univ, Mt Suhora Observ, PL-30084 Krakow, Poland 10.Jagiellonian Univ, Krakow, Poland
推荐引用方式 GB/T 7714	Kepler, SO,Nather, RE,Winget, DE,et al. The everchanging pulsating white dwarf GD358[J]. ASTRONOMY & ASTROPHYSICS,2003,401(2):639-654.
APA	Kepler, SO.,Nather, RE.,Winget, DE.,Nitta, A.,Kleinman, SJ.,...&Bradley, P.(2003).The everchanging pulsating white dwarf GD358.ASTRONOMY & ASTROPHYSICS,401(2),639-654.
MLA	Kepler, SO,et al."The everchanging pulsating white dwarf GD358".ASTRONOMY & ASTROPHYSICS 401.2(2003):639-654.