The Astronomical Journal

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The Astronomical Journal Volume 121 Number 6 Create an alert RSS this journal

J. Davy Kirkpatrick et al. 2001 The Astronomical Journal 121 3235 doi:10.1086/321085

Brown Dwarf Companions to G-Type Stars. I. Gliese 417B and Gliese 584C*

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J. Davy Kirkpatrick1, Conard C. Dahn2, David G. Monet2, I. Neill Reid3,6, John E. Gizis1, James Liebert4 and Adam J. Burgasser5

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Abstract References Cited By

We present astrometric and spectroscopic observations confirming that two nearby G dwarf systems (Gliese 417 = BD+36°2162 and Gliese 584AB = η CrB AB) have a widely separated, L dwarf, substellar companion. Using age estimates of the G dwarf primaries, we estimate masses for these L dwarfs from theoretical evolutionary tracks. For the L4.5 dwarf Gl 417B we estimate an age of 0.08–0.3 Gyr and a mass of 0.035 ± 0.015 Modot. For the L8 dwarf Gl 584C we estimate an age of 1.0–2.5 Gyr and a mass of 0.060 ± 0.015 Modot. This latter object also shows evidence of spectrum variability, which may be due to surface inhomogeneities rotating into and out of view. These new companions are also compared to six other L dwarf and T dwarf companions previously recognized. For the L dwarf companions, ages implied by the presence or absence of lithium are consistent with ages inferred from the primaries alone.


Footnote
*  Portions of the data presented herein were obtained at the W. M. Keck Observatory which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support of the W. M. Keck Foundation.
Keywords

infrared: stars; stars: atmospheres; stars: distances; stars: fundamental parameters; stars: low-mass, brown dwarfs


Dates

Issue 6 (2001 June)

Received 2000 December 26, accepted for publication 2001 March 12



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