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Parallaxes of Brown Dwarfs at USNO

Published online by Cambridge University Press:  26 May 2016

Hugh C. Harris ,
Conard C. Dahn ,
Frederick J. Vrba ,
Harry H. Guetter ,
Blaise Canzian ,
Arne A. Henden ,
Stephen E. Levine ,
Christian B. Luginbuhl ,
Alice K. B. Monet  and
David G. Monet
...Show all authors
Hugh C. Harris
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Conard C. Dahn
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Frederick J. Vrba
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Harry H. Guetter
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Blaise Canzian
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Arne A. Henden
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Stephen E. Levine
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Christian B. Luginbuhl
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Alice K. B. Monet
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
David G. Monet
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Jeffery R. Pier
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Ronald C. Stone
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149
Richard L. Walker
Affiliation:
U. S. Naval Observatory, P.O. Box 1149, Flagstaff, AZ 86002-1149

Abstract

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Trigonometric parallaxes have been measured by Dahn et al. (2002) for 28 cool dwarfs and brown dwarfs, including 17 L dwarfs and three T dwarfs. Broadband CCD and near-IR photometry (VRIz*JHK) have been obtained for these objects and for 24 additional late-type dwarfs. These data have been supplemented with astrometry and photometry from the literature, including parallaxes for the brighter companions of ten L and two T dwarfs. The absolute magnitudes and colors are reviewed here. The I - J color and the spectral type are both good predictors of absolute magnitude for late-M and L dwarfs. MJ becomes monotonically fainter with I - J color and with spectral type through late-L dwarfs, then brightens for early-T dwarfs. In contrast, the J - K color correlates poorly with absolute magnitude for L dwarfs. Using several other parameters from the literature (Li detection, Hα emission strength, projected rotation velocity, and tangential velocity), we fail to uncover any measurable parameter that correlates with the anomalous J - K color.

Type
Part 7. Atmospheres and Internal Structure
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 409 - 412
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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