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27 April 2024 |
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Parallaxes of Brown Dwarfs at USNO | | H.C. Harris
; C.C. Dahn
; F.J. Vrba
; H.H. Guetter
; B. Canzian
; A.A. Henden
; S.E. Levine
; C.B. Luginbuhl
; A.K.B. Monet
; D.G. Monet
; J.R. Pier
; R.C. Stone
; R.L. Walker
; | | Date: |
1 Aug 2002 | | Subject: | astro-ph | | 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, H-alpha emission strength, projected rotation velocity, and tangential velocity), we fail to uncover any measurable parameter that correlates with the anomalous J-K color. | | Source: | arXiv, astro-ph/0208014 | | Services: | Forum | Review | PDF | Favorites | |
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