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Whole earth telescope observations of the ZZ Ceti star HL Tau 76
Dolez, N; Vauclair, G; Kleinman, SJ; Chevreton, M; Fu, JN; Solheim, JE; Perez, JMG; Ulla, A; Fraga, L; Kanaan, A; Reed, M; Kawaler, S; O'Brien, MS; Metcalfe, TS; Nather, RE; Sanwal, D; Klumpe, EW; Mukadam, A; Wood, MA; Ahrens, TJ; Silvestri, N; Sullivan, D; Sullivan, T; Jiang, XJ; Xu, DW; Ashoka, BN; Leibowitz, E; Ibbetson, P; Ofek, E; Kilkenny, D; Meistas, EG; Alisauskas, D; Janulis, R; Kalytis, R; Moskalik, P; Zola, S; Krzesinski, J; Ogloza, W; Handler, G; Silvotti, R; Bernabei, S
AbstractThis 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.
KeywordStars : Interiors Stars : Individual : Hl Tau 76 Stars : Oscillations Stars : White Dwarfs
Indexed BySCI
WOS IDWOS:000234533900019
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Document Type期刊论文
Affiliation1.Univ Toulouse 3, UMR5572, CNRS, F-31400 Toulouse, France
2.Apache Point Observ, Sloan Digital Sky Survey, Sunspot, NM 88349 USA
3.Univ Tromso, Dept Phys, N-9037 Tromso, Norway
4.LESIA, Observ Paris, F-92195 Meudon, France
5.Univ Vigo, Dept Fis Aplicada, Vigo 36200, Spain
6.Iowa State Univ, Dept Phys & Astron, Ames, IA 50011 USA
7.Univ Fed Santa Catarina, Florianopolis, SC, Brazil
8.Univ Texas, Dept Astron, Austin, TX 78712 USA
9.Univ Texas, McDonald Observ, Austin, TX 78712 USA
10.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA
11.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA
12.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand
13.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
14.Indian Space Res Org, Bangalore 560017, Karnataka, India
15.Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel
16.S African Astron Observ, ZA-7935 Cape Town, South Africa
17.Vilnius State Univ, Res Inst Theoret Phys & Astron, LT-01108 Vilnius, Lithuania
18.Copernicus Astron Ctr, PL-00716 Warsaw, Poland
19.Cracow Pedagog Univ, Mt Suhora Observ, PL-30084 Krakow, Poland
20.Univ Vienna, Inst Astron, A-1180 Vienna, Austria
21.Osserv Astron Capodimonte, I-80131 Naples, Italy
22.Vrije Univ Brussels, Astron Grp, B-1050 Brussels, Belgium
23.Univ Oslo, Inst Theoret Astrophys, N-0315 Oslo, Norway
Recommended Citation
GB/T 7714
Dolez, N,Vauclair, G,Kleinman, SJ,et al. Whole earth telescope observations of the ZZ Ceti star HL Tau 76[J]. ASTRONOMY & ASTROPHYSICS,2006,446(1):237-U28.
APA Dolez, N.,Vauclair, G.,Kleinman, SJ.,Chevreton, M.,Fu, JN.,...&Bernabei, S.(2006).Whole earth telescope observations of the ZZ Ceti star HL Tau 76.ASTRONOMY & ASTROPHYSICS,446(1),237-U28.
MLA Dolez, N,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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