VLT/NACO adaptive optics imaging of the TY CrA system

Free access article

Issue		A&A Volume 406, Number 3, August II 2003


Page(s)		L51 - L54
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20030554

A&A 406, L51-L54 (2003)
DOI: 10.1051/0004-6361:20030554

Letter

A fourth stellar component candidate detected

G. Chauvin¹, A.-M. Lagrange¹, H. Beust¹, T. Fusco², D. Mouillet³, F. Lacombe⁴, P. Pujet⁵, G. Rousset², E. Gendron⁴, J.-M. Conan², D. Bauduin⁴, D. Rouan⁴, W. Brandner⁶, R. Lenzen⁶, N. Hubin⁷ and M. Hartung⁶

¹ Laboratoire d'Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, 38400 Saint-Martin d'Hères, France
² ONERA, BP52, 29 avenue de la Division Leclerc, 92320 Châtillon Cedex, France
³ Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, 57 Av. d'Azereix, BP 826, 65008 Tarbes Cedex, France
⁴ Laboratoire D'Études Spatiales et d'Instrumentation en Astrophysique, Observatoire de Paris, Bat. 16, 5 Place J. Jansen, 92195 Meudon, France
⁵ Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela, HI96743, USA
⁶ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
⁷ ESO, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany

(Received 17 February 2003 / Accepted 13 April 2003)

Abstract
We report the detection of a possible subsolar mass companion to the triple young system TY CrA using the NACO instrument at the VLT UT4 during its commissioning. Assuming for TY CrA a distance similar to that of the close binary system HD 176386, the photometric spectral type of this fourth stellar component candidate is consistent with an ~M 4 star. We discuss the dynamical stability of this possible quadruple system as well as the possible location of dusty particles inside or outside the system.

Key words: binaries: eclipsing -- stars: pre-main sequence -- stars: low-mass -- circumstellar matter

Offprint request: G. Chauvin, gchauvin@obs.ujf-grenoble.fr

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