Whole earth telescope observations of the ZZ Ceti star HL Tau 76
文献类型：期刊论文
| 作者 | Alisauskas, D; Janulis, R; Kalytis, R; Moskalik, P; Zola, S; Krzesinski, J; Ogloza, W; Handler, G; Silvotti, R; Bernabei, S |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2006 |
| 卷号 | 446期号:1页码:237-U28 |
| 关键词 | Stars : Interiors Stars : Individual : Hl Tau 76 Stars : Oscillations Stars : White Dwarfs |
| DOI | 10.1051/0004-6361:20053149 |
| 英文摘要 | This paper analyses the Whole Earth Telescope observations of HL Tau 76, the first discovered pulsating DA white dwarf. The star was observed during two Whole Earth Telescope campaigns. It was a second priority target during the XCOV13 campaign in 1996 and the first priority one during the XCOV18 campaign in 1999. The 1999 campaign reached 66.5% duty cycle. With a total duration of 18 days, the frequency resolution achieved is 0.68 mu Hz. With such a frequency resolution, we were able to find as many as 78 significant frequencies in the power spectrum, of which 34 are independent frequencies after removal of all linear combinations. In taking into account other frequencies present during the 1996 WET campaign and those present in earlier data, which do not show up in the 1999 data set, we find a total of 43 independent frequencies. This makes HL Tau 76 the richest ZZ Ceti star in terms of number of observed pulsation modes. We use those pulsation frequencies to determine as much as possible of the internal structure of HL Tau 76. The pulsations in HL Tau 76 cover a wide range of periods between 380 s and 1390 s. We propose an identification for 39 of those 43 frequencies in terms of l = 1 and l = 2 non-radial g-modes split by rotation. We derive an average rotation period of 2.2 days. The period distribution of HL Tau 76 is best reproduced if the star has a moderately "thick" hydrogen mass fraction log q(H) >= -7.0. The results presented in this paper constitute a starting point for a detailed comparison of the observed periods with the periods calculated for models as representative as possible of HL Tau 76. |
| 语种 | 英语 |
| WOS记录号 | WOS:000234533900019 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8950]  |
| 专题 | 国家天文台_空间科学研究部 |
| 作者单位 | 1.Univ Vigo, Dept Fis Aplicada, Vigo 36200, Spain 2.Univ Vienna, Inst Astron, A-1180 Vienna, Austria 3.Cracow Pedagog Univ, Mt Suhora Observ, PL-30084 Krakow, Poland 4.Copernicus Astron Ctr, PL-00716 Warsaw, Poland 5.Vilnius State Univ, Res Inst Theoret Phys & Astron, LT-01108 Vilnius, Lithuania 6.S African Astron Observ, ZA-7935 Cape Town, South Africa 7.Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel 8.Indian Space Res Org, Bangalore 560017, Karnataka, India 9.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 10.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand |
| 推荐引用方式 GB/T 7714 | Alisauskas, D,Janulis, R,Kalytis, R,et al. Whole earth telescope observations of the ZZ Ceti star HL Tau 76[J]. ASTRONOMY & ASTROPHYSICS,2006,446(1):237-U28. |
| APA | Alisauskas, D.,Janulis, R.,Kalytis, R.,Moskalik, P.,Zola, S.,...&Kawaler, S.(2006).Whole earth telescope observations of the ZZ Ceti star HL Tau 76.ASTRONOMY & ASTROPHYSICS,446(1),237-U28. |
| MLA | Alisauskas, D,et al."Whole earth telescope observations of the ZZ Ceti star HL Tau 76".ASTRONOMY & ASTROPHYSICS 446.1(2006):237-U28. |
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来源：国家天文台
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