Time Domain Astrophysics
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Transcript of Time Domain Astrophysics
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Time Domain Astrophysics
Stephen PotterSouth African Astronomical Observatory
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Overview
What is Time Domain Astrophysics (Astrotomography)? Variability in Interacting Binaries
Cataclysmic Variables Doppler Tomography
Roche Tomography
Stokes Imaging
Eclipse Mapping
SALT first Science High speed CCD photometry
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Variability in Interacting Binaries
– Accretion onto WD in CVs – Porb : minutes – hours– Pspin : tens of seconds – Mass accretion events/ outbursts : months– Magnetic cycles : years – decades
– WD/inner disc dominate soft X-ray, UV (SALT strength) – Outer disc emission mostly in optical– Mass donor reveals itself in the red/IR
– For X-ray binaries (NS/BH) keV/MeV emission + – variability as fast as milliseconds
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Cataclysmic Variables
A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/ 4
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Magnetic Cataclysmic Variables
A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/ 5
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Magnetic Cataclysmic Variables
A.P. Beardmore http://www.astro.keele.ac.uk/~apb/OGL_CV/ 6
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Doppler Tomography
Schwope et al, 1997, A&A, 319, 894 8
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Doppler Tomography
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Roche Tomography
Potter, Romero-Colmenero, Watson, Buckley, Phillips 2004, MNRAS, 348, 31610
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Spectral eclipse mapping
Rutten et al. 1993 Nature, 362, 518 11
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Multi-epoch Doppler Tomography
Schwope et al. 2000, MNRAS, 313, 533 12
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Spin Doppler Tomography
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Steeghs, D., Harlaftis, E.T., Horne, K., 1999, MNRAS, 306, 348
Targets of opportunityDoppler Tomography
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Spectral eclipse mapping
Baptista et al. 2000 MNRAS, 314, 727 15
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Stokes imaging
Potter et al. 2004, MNRAS, 348,316 16
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SALTICAM light curves of SDSS J015543.30+002807.2
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