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DQ Herculis in profile: Whole Earth Telescope observations and smoothed particle hydrodynamics simulations of an edge-on cataclysmic variable system
Wood, MA; Robertson, JR; Simpson, JC; Kawaler, SD; O'Brien, MS; Nather, RE; Winget, DE; Montgomery, MH; Metcalfe, TS; Jiang, XJ; Leibowitz, EM; Ibbetson, P; O'Donoghue, D; Zola, S; Krzesinski, J; Pajdosz, G; Vauclair, G; Dolez, N; Chevreton, M; Sullivan, DJ; Kanaan, A; Nitta, A
2005-11-20
Source PublicationASTROPHYSICAL JOURNAL
Volume634Issue:1Pages:570-584
AbstractThe 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.
KeywordBinaries : Close Accretion Hydrodynamics Accretion Disks Stars : Individual (Dq Her) Novae Cataclysmic Variables
Indexed BySCI
Language英语
WOS IDWOS:000233347800050
Citation statistics
Cited Times:12[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8942
Collection光学天文研究部
Affiliation1.Florida Inst Technol, Dept Phys & Space Sci, Melbourne, FL 32901 USA
2.Florida Inst Technol, SARA Observ, Melbourne, FL 32901 USA
3.Appalachian State Univ, Dept Phys & Astron, Boone, NC 28608 USA
4.NASA, Range Syst Design & Dev Branch, Kennedy Space Ctr, FL 32899 USA
5.Iowa State Univ, Dept Phys, Ames, IA 50011 USA
6.Yale Univ, Dept Astron, New Haven, CT 06511 USA
7.Univ Texas, Dept Astron, Austin, TX 78712 USA
8.Univ Texas, McDonald Observ, Austin, TX 78712 USA
9.Univ Cambridge, Astron Inst, Cambridge CB3 0HA, England
10.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
11.Chinese Acad Sci, Natl Astron Observ, Beijing Astron Observ, Beijing 100012, Peoples R China
12.Tel Aviv Univ, Dept Phys & Astron, IL-69978 Tel Aviv, Israel
13.Tel Aviv Univ, Wise Observ, IL-69978 Tel Aviv, Israel
14.S African Astron Observ, ZA-7935 Cape Town, South Africa
15.Jagiellonian Univ, Astron Observ, PL-30244 Krakow, Poland
16.Pedagog Univ, Mt Suhora Observ, PL-30024 Krakow, Poland
17.Univ Toulouse 3, Observ Midi Pyrenees, CNRS UMRS 5572, F-31400 Toulouse, France
18.DAEC, Observ Paris, F-92195 Meudon, France
19.Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington, New Zealand
20.Univ Fed Santa Catarina, Dept Fis, BR-88040900 Florianopolis, SC, Brazil
21.Apache Point Observ, Sunspot, NM 88349 USA
Recommended Citation
GB/T 7714
Wood, MA,Robertson, JR,Simpson, JC,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 Wood, MA.,Robertson, JR.,Simpson, JC.,Kawaler, SD.,O'Brien, MS.,...&Nitta, A.(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 Wood, MA,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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