Volume 440, Number 3, September IV 2005
|Page(s)||967 - 972|
|Section||Stellar structure and evolution|
|Published online||05 September 2005|
The dM4.5e star G124-62 and its binary L dwarf companion DENIS-P J1441-0945
Common proper motion, distance, age, and masses
Astrophysikalisches Institut, Universität Jena, Schillergässchen 2-3, 07745 Jena, Germany e-mail: firstname.lastname@example.org
2 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany
3 Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
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 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 .
Key words: astrometry / solar neighbourhood / stars: emission-line, Be / stars: low-mass, brown dwarfs
© ESO, 2005
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