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Modeling of Interacting Binary Systems

Modeling of Interacting Binary Systems. O. Latković , G. Đurašević , I. Vince & A. Čeki Astronomical Observatory of Belgrade. Binary star research in the stellar physics group at AOB. Massive binaries Overcontact systems Systems with gas streams and accretion disks

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Modeling of Interacting Binary Systems

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  1. Modeling of Interacting Binary Systems O. Latković, G. Đurašević, I. Vince & A. Čeki Astronomical Observatory of Belgrade

  2. Binary star research in the stellar physics group at AOB • Massive binaries • Overcontact systems • Systems with gas streams and accretion disks • Double-periodic variables

  3. The model of a close binary system • Roche model • Gravity darkening • Irradiation feedback • Bright or dark circular spots • Accretion disk • Trapezoid cross-section • Radial temperature distribution • Active regions as bright spots

  4. Active regions on the disk: hot spot and spiral structure • The HOT SPOT(hot line) is a representation of the area where the gas stream from the donor impacts the disk around the gainer • The BRIGHT SPOTSrepresent the brightness irregularities that arise from spiral structure

  5. V455 Cyg: a peculiar massive binary with an accretion disk • Spectroscopy • Echelle spectrograph attached to 1.25 m telescope (SAI Crimean Observatory) • Photometry • 60 cm telescope (Maidanak Observatory) • 60 cm telescope (SAI Crimean Observatory) • System parameters: Monthly Notices of the Royal Astronomical SocietyVolume 420, Issue 4, pages 3081-3090, 10 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20208.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20208.x/full#f3

  6. V455 Cyg: a peculiar massive binary with an accretion disk • Spectroscopy • Echelle spectrograph attached to 1.25 m telescope (SAI Crimean Observatory) • Photometry • 60 cm telescope (Maidanak Observatory) • 60 cm telescope (SAI Crimean Observatory) • System parameters: Monthly Notices of the Royal Astronomical SocietyVolume 420, Issue 4, pages 3081-3090, 10 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20208.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20208.x/full#f3

  7. V455 Cyg: a peculiar massive binary with an accretion disk • Spectroscopy • Echelle spectrograph attached to 1.25 m telescope (SAI Crimean Observatory) • Photometry • 60 cm telescope (Maidanak Observatory) • 60 cm telescope (SAI Crimean Observatory) • System parameters: Monthly Notices of the Royal Astronomical SocietyVolume 420, Issue 4, pages 3081-3090, 10 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20208.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20208.x/full#f3

  8. V455 Cyg: a peculiar massive binary with an accretion disk • Spectroscopy • Echelle spectrograph attached to 1.25 m telescope (SAI Crimean Observatory) • Photometry • 60 cm telescope (Maidanak Observatory) • 60 cm telescope (SAI Crimean Observatory) • System parameters: Monthly Notices of the Royal Astronomical SocietyVolume 420, Issue 4, pages 3081-3090, 10 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20208.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20208.x/full#f3

  9. V393 Sco: a double-periodic binary • Observations • REM 60 cm telescope (La Silla) • ASAS array (Las Campanas) Monthly Notices of the Royal Astronomical SocietyVolume 421, Issue 1, pages 862-871, 9 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20363.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20363.x/full#f1

  10. V393 Sco: a double-periodic binary • Observations • REM 60 cm telescope (La Silla) • ASAS array (Las Campanas) Monthly Notices of the Royal Astronomical SocietyVolume 421, Issue 1, pages 862-871, 9 FEB 2012 DOI: 10.1111/j.1365-2966.2011.20363.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2011.20363.x/full#f1

  11. AU Mon: another double-periodic binary Monthly Notices of the Royal Astronomical SocietyVolume 409, Issue 1, pages 329-336, 17 AUG 2010 DOI: 10.1111/j.1365-2966.2010.17310.xhttp://onlinelibrary.wiley.com/doi/10.1111/j.1365-2966.2010.17310.x/full#f1

  12. Recent improvements of the model • A different geometrical approach • Simultaneous fitting of light and radial velocity curves • Elliptical orbits • Enhanced modeling of accretion disks • Modeling of stellar pulsations

  13. A different geometrical representation • Sampling strategy: geodesic grid • Uniform sampling of the surface • Allows for very fine division • Colors represent the temperature distribution • Gravity darkening • Irradiation feedback

  14. A different geometrical representation Detailed modeling of the eclipse using adaptive subdivision

  15. Improved modeling of the accretion disk • Disk shapes • Concave and convex disks • Toroidal disks • Multiple disks / disks with holes • Fine surface division • Temperature distribution and angular velocity distribution as arbitrary functions

  16. Modeling of stellar pulsations • Perturbations are modeled as spherical harmonics and applied to position and temperature • Arbitrary number of modes • Arbitrary pulsation axis • L=5, M=5 • L=4, M=2 • Superposition

  17. Modeling of stellar pulsations A single L=10, M=5 mode with exaggerated displacement amplitude

  18. Modeling of Interacting Binary Systems O. Latković, G. Đurašević, I. Vince & A. Čeki Astronomical Observatory of Belgrade

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