In:
Symposium - International Astronomical Union, Cambridge University Press (CUP), Vol. 211 ( 2003), p. 409-412
Abstract:
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. M J 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 of Medium:
Online Resource
ISSN:
0074-1809
DOI:
10.1017/S0074180900211017
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2003
SSG:
16,12
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