EDP Sciences
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Volume 440, Number 3, September IV 2005
Page(s) 967 - 972
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20041902

A&A 440, 967-972 (2005)
DOI: 10.1051/0004-6361:20041902

The dM4.5e star G124-62 and its binary L dwarf companion DENIS-P J1441-0945

Common proper motion, distance, age, and masses
A. Seifahrt1, 2, E. Guenther3 and R. Neuhäuser1

1  Astrophysikalisches Institut, Universität Jena, Schillergässchen 2-3, 07745 Jena, Germany
    e-mail: andreas.seifahrt@eso.org
2  European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
3  Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany

(Received 25 August 2004 / Accepted 23 March 2005 )

We present astrometric and photometric measurements of the field binary L1 dwarf DENIS-P J1441-0945. Analysis of archival HST images and photometric parallax measurements give a distance of $34\pm7$ pc and a proper motion close to that of the nearby high proper motion star G124-62. Comparison of SuperCOSMOS and 2MASS images confirms that these objects form a common proper motion pair, while spectroscopy of G124-62 shows it to be a dM4.5e star. The kinematics show that this system is a member of the Hyades supercluster. The resulting age constraints for the system are 500-800 Myr and the mass of each component of DENIS-P J1441-0945 is $0.072^{+0.010}_{-0.018}~{M_{\odot}}$.

Key words: astrometry -- solar neighbourhood -- stars: emission-line, Be -- stars: low-mass, brown dwarfs

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© ESO 2005