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Accretion Channeling in CTTS Scott Gregory, Moira Jardine
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Classical T Tauri Stars (CTTS) (Goodson et al. 1997)
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Magnetic Field Detection in CTTS Surface fields of 1-3 kG detected from: –Zeeman broadened spectral lines (e.g. Johns-Krull et al. 1999). –Circularly polarised lines –Increased line equivalent widths (e.g. Guenther et al. 1999). –Electron-cyclotron maser emission (Smith et al. 2003).
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Accreting Field Extrapolations (Gregory et al. 2004, in preparation) LQ Hya surface map. Potential field extrapolation with source surface. Isothermal corona in hydrostatic equilibrium.
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Accreting Field Extrapolations (Gregory et al. 2004, in preparation) AB Dor surface map. Potential field extrapolation with source surface. Isothermal corona in hydrostatic equilibrium.
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Accretion Footpoints Longitude Latitude
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LQ Hya like field.AB Dor like field. Future Work: X-ray Emission
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LQ Hya like field.AB Dor like field. Future Work: X-ray Emission
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Future Work ESPaDOnS (Echelle SpectroPolarimetric Device for the Observation of Stars at CFHT): –Observations of DF Tau and BP Tau (plus V410 Tau and V830 Tau) in 2005. (Petit, Donati & the ESPaDOnS project team 2004) Magnetospheric accretion models with potential field extrapolations.
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