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Astron. Astrophys. 346, L41-L44 (1999)

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Letter to the Editor

New T Tauri stars in the vicinity of TW Hydrae *

Michael F. Sterzik 1, Juan M. Alcalá 2,3, Elvira Covino 2 and Monika G. Petr 1

1 European Southern Observatory, Casilla 190001, Santiago 19, Chile
2 Osservatorio Astronomico de Capodimonte, Via Moiariello 16, I-80131 Napoli, Italy
3 Instituto Nacional de Astrofisica, Optica y Electrónica, A.P. 51 y 216 C.P. 72000, Puebla, México

Received 12 April 1999 / Accepted 14 May 1999


We report the discovery of four weak-line T Tauri star candidates in the vicinity of the TW Hydrae association, the closest known region of recent star formation. Three stars are probably association members. They exhibit high Lithium abundances, M spectral types, and a high level of chromospheric and coronal activity. Two of them form a binary system. They also share a consistent radial velocity with previously known members of the association. A fourth candidate T Tauri star is of earlier spectral type, has a weaker Lithium absorption feature, and a different radial velocity, and is probably located in the background of the association. Our findings support the idea that the isolated T Tauri stars in that region belong to a physical association around TW Hydrae.

Key words: stars: flare – stars: pre-main sequence – X-rays: stars

* Based on observations obtained at the European Southern Observatory, La Silla, Chile under proposal number 60.C-0170

Send offprint requests to: Michael Sterzik (msterzik@eso.org)

© European Southern Observatory (ESO) 1999

Online publication: June 17, 1999