Post on 29-Mar-2015
MODELING OF INTERACTING BINARY SYSTEMS
O. Latković, G. Đurašević, I. Vince & A. ČekiAstronomical Observatory of Belgrade
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BINARY STAR RESEARCH IN THE STELLAR PHYSICS GROUP AT AOB
Massive binaries Overcontact systems Systems with gas streams and accretion disks Double-periodic variables
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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
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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 SPOTS represent the brightness irregularities that arise from spiral structure
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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
Primary Secondary DiskM[Mʘ] 14.0 5.5
R [Rʘ] 6.6 14.4 14.5
T [K] 25400 13200 9500
Orbital parametersPORB [d] 8.76
aORB [Rʘ] 48.0
i [⁰] 78.2
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V455 CYG: A PECULIAR MASSIVE BINARY WITH AN ACCRETION DISK
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
Primary Secondary DiskM[Mʘ] 14.0 5.5
R [Rʘ] 6.6 14.4 14.5
T [K] 25400 13200 9500
Orbital parametersPORB [d] 8.76
aORB [Rʘ] 48.0
i [⁰] 78.2
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:
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V455 CYG: A PECULIAR MASSIVE BINARY WITH AN ACCRETION DISK
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
Primary Secondary DiskM[Mʘ] 14.0 5.5
R [Rʘ] 6.6 14.4 14.5
T [K] 25400 13200 9500
Orbital parametersPORB [d] 8.76
aORB [Rʘ] 48.0
i [⁰] 78.2
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:
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V455 CYG: A PECULIAR MASSIVE BINARY WITH AN ACCRETION DISK
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
Primary Secondary DiskM[Mʘ] 14.0 5.5
R [Rʘ] 6.6 14.4 14.5
T [K] 25400 13200 9500
Orbital parametersPORB [d] 8.76
aORB [Rʘ] 48.0
i [⁰] 78.2
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:
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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
Primary Secondary DiskM[Mʘ] 7.8 2.0R [Rʘ] 4.4 9.4 9.1T [K] 16600 7900 8600
Orbital parametersPORB [d] 7.71aORB [Rʘ] 35.1i [⁰] 80.0
PLONG [d] 253 PLONG/PORB 33
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V393 SCO: A DOUBLE-PERIODIC BINARY
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
Observations REM 60 cm telescope (La Silla) ASAS array (Las Campanas)
Primary Secondary DiskM[Mʘ] 7.8 2.0R [Rʘ] 4.4 9.4 9.1T [K] 16600 7900 8600
Orbital parametersPORB [d] 7.71aORB [Rʘ] 35.1i [⁰] 80.0
PLONG [d] 253 PLONG/PORB 33
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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
Primary Secondary DiskM[Mʘ] 7.0 1.20
R [Rʘ] 5.1 10.1 14.5
T [K] 15900 5750 9500
Orbital parametersPORB [d] 11.11
aORB [Rʘ] 42.1
i [⁰] 80.1
PLONG [d] 417 PLONG/PORB 37.5
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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
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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
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A DIFFERENT GEOMETRICAL REPRESENTATIONDetailed modeling of the eclipse using adaptive subdivision
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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
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MODELING OF STELLAR PULSATIONS
Perturbations are modeled as spherical harmonics and applied to position and temperature
Arbitrary number of modes Arbitrary pulsation axis
L=4, M=2 L=5, M=5 Superposition
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MODELING OF STELLAR PULSATIONSA single L=10, M=5 mode with exaggerated displacement amplitude
MODELING OF INTERACTING BINARY SYSTEMS
O. Latković, G. Đurašević, I. Vince & A. ČekiAstronomical Observatory of Belgrade