Near Infrared Spectroscopy of TW Hya: A pdf

Near Infrared Spectroscopy of TW Hya: A

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7500 K and n_e ~ 10^{12} – 10^{13} cm^{-3}. The thickness of the emitting region is 10^2 – 10^4 km and the covering fraction is f_ast ~ 0.04. Our derived physical parameter values agree with the predictions of the magnetospheric accretion scenario. The highest signal-to-noise H lines have profiles that indicate multiple emission components. We derive an excess spectrum (above that of the M2.5V template) that peaks in the H band.

Although our derived veiling values, ~ 0.1, agree with previous estimates, the excess spectrum does not match that of current models in which this flux is generated by an inner optically thin disk. We suggest that the excess flux spectrum instead reflects the differences in atmospheric opacity, gravity, and age between TW Hya and older, higher gravity field M2.5 dwarfs

• Creator/s: William D. Vacca, Göran Sandell
• Date: 2/2/2011

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