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| Paper: |
Extended (15 X 6 AU) Hα Emission Around T Tau N |
| Volume: |
154, Cool Stars, Stellar Systems and the Sun: Tenth Cambridge Workshop |
| Page: |
1684 |
| Authors: |
Garcia, P. J. V.; Thiebaut, E. |
| Abstract: |
We present an image of T Tauri N reconstructed from speckle interferometry observations made at the 3.6 m Canada-France-Hawaii Telescope (CFHT). Two spectral windows, at Hα (6540-6580 AA) and the nearby red continuum (6580-6840 AA) were used. The star is unresolved in the continuum (theta <= 0.038"), setting an upper limit for its size of <= 5.3 AU (assuming a 140 pc distance). At Hα (continuum subtracted) two components are observed, an unresolved one with 70% of the Hα flux and a resolved 0.106" x 0.043" (15 x 6 AU) one with 30%. The extended component is elongated in the North-South direction. The current paradigm for T Tauri stars understands them as acretion-ejection systems consisting of a magnetospheric boundary layer (MBL), a stellar/disk jet and a disk corona. The extended Hα component scale, its non-detection in the continuum, and T Tau Hα profile shape suggest that the extension is a disk corona. Hα line profiles are currently interpreted as arising in the MBL. Our present observations show that, the corona emission contributes significantly (~1/3) to the Hα profile. |
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