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Centro de Astrofísica da Universidade do Porto

Extended (15 × 6 AU) Hα Emission Around T Tau N

P. J. V. Garcia, E. Thiébaut


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 Å] and red continuum [6580-6840 Å] were used. The star is unresolved in the continuum (θ ≤ 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 × 0″043 (15 × 6 AU) with 30 %. The extended component is elongated in the North-South direction.

The extended Hα component scale, it's non-detection in the continuum, and TTau Hα profile shape suggest that the extension is a disk corona.

Astrophysics and Space Science
Volume 261, Page 141
January 1999

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