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Discovery of a widely separated binary system of very low mass stars.pdf

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Discovery of a widely separated binary system of very low mass stars

a r X i v : a s t r o - p h / 0 5 0 6 6 2 1 v 2 8 J u l 2 0 0 5 Astronomy Astrophysics manuscript no. Hf032 February 2, 2008 (DOI: will be inserted by hand later) Discovery of a widely separated binary system of very low mass stars ? N. Phan-Bao1, E.L. Mart??n2,3, C. Reyle?4, T. Forveille5,6 , and J. Lim1 1 Institute of Astronomy and Astrophysics, Academia Sinica. P.O. Box 23-141, Taipei 106, Taiwan, R.O.C. 2 Instituto de Astrof??sica de Canarias, C/ V??a La?ctea s/n, E-38200 La Laguna (Tenerife), Spain. 3 University of Central Florida, Dept. of Physics, PO Box 162385, Orlando, FL 32816-2385, USA. 4 CNRS UMR6091, Observatoire de Besanc?on, BP1615, 25010 Besanc?on Cedex, France. 5 Canada-France-Hawaii Telescope Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743 USA. 6 Laboratoire d’Astrophysique de Grenoble, Universite? J. Fourier, B.P. 53, F-38041 Grenoble, France. Received / Accepted Abstract. We report our discovery of a nearby wide binary system, LP 714-37 AB. Phan-Bao et al. identified LP 714-37 as a mid-M dwarf during a cross-identification of the NLTT and DENIS catalogues. Our CCD images resolve the system into a binary with a projected angular separation of 1.8′′, or 33 AU, and low-resolution optical spectra give spectral types of M5.5 (LP 714-37A) and M7.5 (LP 714-37B). This makes LP 714-37 AB one of very few widely separated (separation 30 AU) very low-mass binary systems known in the field, and we discuss it in the context of the multiplicity properties of very low-mass stars and brown dwarfs. Key words. binary stars, very low mass stars, brown dwarfs, individual star: DENIS-P J0410-1251, LP 714-37 1. Introduction Binary systems have been studied for decades to measure accurate stellar masses, and to test evolutionary models and star formation theories. Considerable attention has recently been paid to very low-mass (VLM) companions to low-mass stars (Duquennoy Mayor 1991; Fischer Marcy 1992; Delfosse et al. 1999; Reid et al. 2001; Beuzit et