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Title:
The dM4.5e star G124-62 and its binary L dwarf companion DENIS-P J1441-0945. Common proper motion, distance, age, and masses
Authors:
Seifahrt, A.; Guenther, E.; Neuhäuser, R.
Affiliation:
AA(Astrophysikalisches Institut, Universität Jena, Schillergässchen 2-3, 07745 Jena, Germany ; European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany), AB(Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany), AC(Astrophysikalisches Institut, Universität Jena, Schillergässchen 2-3, 07745 Jena, Germany)
Publication:
Astronomy and Astrophysics, Volume 440, Issue 3, September IV 2005, pp.967-972 (A&A Homepage)
Publication Date:
09/2005
Origin:
EDP Sciences
Keywords:
astrometry, solar neighbourhood, stars: emission-line, Be, stars: low-mass, brown dwarfs
DOI:
10.1051/0004-6361:20041902
Bibliographic Code:
2005A&A...440..967S

Abstract

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±7 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 {Mȯ}.
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