DQ Herculis in profile: Whole Earth Telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system
文献类型：期刊论文
| 作者 | Sullivan, DJ; Wood, MA; Vauclair, G; Robertson, JR; Kanaan, A; Nitta, A; Chevreton, M; Dolez, N; Krzesinski, J; Zola, S |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2005-11-20 |
| 卷号 | 634期号:1页码:570-584 |
| 关键词 | Binaries : Close Accretion Hydrodynamics Accretion Disks Stars : Individual (Dq Her) Novae Cataclysmic Variables |
| 英文摘要 | The old nova DQ Herculis was the Whole Earth Telescope Northern Hemisphere target for the 1997 July campaign and was observed on four nights with the SARA 0.9 m telescope during 2003 June. We present updated ephemerides for the eclipse and 71 s timings. The Fourier transform displays power at the presumed white dwarf spin period of 71.0655 s, but no significant power at either 142 or 35.5 s. The mean pulsed light curve is obtained by folding on the orbital period modulus the mean ephemeris of the 71 s period, and from this we calculate an O - C phase diagram and amplitude versus orbital phase diagrams. In addition to the phase variations during eclipse ingress and egress, the WET data reveal significant phase variations outside of eclipse. These must result from the self-eclipse of a non-axisymmetric disk. We simulated the disk in DQ Her using smoothed particle hydrodynamics. We improve our effective spatial signal-to-noise ratio by combining 250 snapshots of the N = 20; 000 phase space solution over time to obtain a 5 million particle ensemble disk. From the surface shape of the ensemble disk, the radius and vertical height above the midplane of the rim of the reprocessing region can be derived as a function of azimuthal angle. From this profile we can calculate the O - C phase and amplitude diagrams as a function of inclination angle. The calculated O - C diagrams are a remarkably good match to the observed phase and amplitude variations of the 71 s signal. The best match is for inclination angle 89.degrees 7. |
| 语种 | 英语 |
| WOS记录号 | WOS:000233347800050 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8942]  |
| 专题 | 国家天文台_光学天文研究部 |
| 作者单位 | 1.Pedagog Univ, Mt Suhora Observ, PL-30024 Krakow, Poland 2.Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil 3.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand 4.DAEC, Observ Paris, F-92195 Meudon, France 5.Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland 6.Univ Toulouse 3, Observ Midi Pyrenees, CNRS UMRS 5572, F-31400 Toulouse, France 7.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA 8.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA 9.Appalachian State Univ, Dept Phys & Astron, Boone, NC 28608 USA 10.NASA, Range Syst Design & Dev Branch, Kennedy Space Ctr, FL 32899 USA |
| 推荐引用方式 GB/T 7714 | Sullivan, DJ,Wood, MA,Vauclair, G,et al. DQ Herculis in profile: Whole Earth Telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system[J]. ASTROPHYSICAL JOURNAL,2005,634(1):570-584. |
| APA | Sullivan, DJ.,Wood, MA.,Vauclair, G.,Robertson, JR.,Kanaan, A.,...&Simpson, JC.(2005).DQ Herculis in profile: Whole Earth Telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system.ASTROPHYSICAL JOURNAL,634(1),570-584. |
| MLA | Sullivan, DJ,et al."DQ Herculis in profile: Whole Earth Telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system".ASTROPHYSICAL JOURNAL 634.1(2005):570-584. |
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来源：国家天文台
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