Research Note

Identification of the TW Hydrae association member 2M1235-39: a tertiary component of the HR 4796 system

¹ Laboratoire d'Astrophysique de Grenoble, Université Joseph Fourier – CNRS, BP 53, 38041 Grenoble Cedex, France e-mail: joel.kastner@obs.ujf-grenoble.fr
² Chester F. Carlson Center for Imaging Science, Rochester Institute of Technology, 54 Lomb Memorial Dr., Rochester, NY 14623, USA
³ Dept. of Physics & Astronomy, University of California, Los Angeles 90095, USA
⁴ UCLA Center for Astrobiology, University of California, Los Angeles 90095, USA
⁵ Research School of Astronomy and Astrophysics, The Australian National University, Weston, ACT 2611, Australia

Received: 12 July 2008
Accepted: 7 August 2008

Abstract

Aims. We seek to determine whether the late-type star 2MASS J12354893-3950245 (2M1235-39) is a member of the TW Hya Association (TWA), a hypothesis suggested by its association with a bright X-ray source detected serendipitously by ROSAT and XMM-Newton and its (~3') proximity to the well-studied (A+M binary) system HR 4796.

Methods. We used optical spectroscopy to establish the Li and Hα line strengths of 2M1235-39, and determined its proper motion via optical imaging. We also considered its X-ray and near-IR fluxes relative to the M star HR 4796B.

Results. The optical spectrum of 2M1235-39 displays strong Li absorption and Hα emission (equivalent widths of 630 mÅ and –6.7 Å, respectively). Comparison of the spectrum with that of a nearby field star, along with the DENIS catalog IJK magnitudes, indicates the spectral type of 2M1235-39 is M4.5. We measure a proper motion for 2M1235-39 that agrees, within the errors, with that of HR 4796.

Conclusions. The Li absorption and Hα emission line strengths of 2M1235-39, its near-IR and X-ray fluxes, and its proper motion all indicate that 2M1235-39 is a TWA member. Most likely this star is a wide (13 500 AU) separation, low-mass, tertiary component of the HR 4796 system.