Parallaxes of Brown Dwarfs at USNO

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dc.creatorHarris, H. C.
dc.creatorDahn, C. C.
dc.creatorVrba, F. J.
dc.creatorGuetter, H. H.
dc.creatorCanzian, B.
dc.creatorHenden, A. A.
dc.creatorLevine, S. E.
dc.creatorLuginbuhl, C. B.
dc.creatorMonet, A. K. B.
dc.creatorMonet, D. G.
dc.creatorPier, J. R.
dc.creatorStone, R. C.
dc.creatorWalker, R. L.
dc.date2002-07-31
dc.date.accessioned2026-07-07T02:04:31Z
dc.date.available2026-07-07T02:04:31Z
dc.descriptionTrigonometric 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.
dc.description4 pages, including 2 figures. Paper given at IAU Symp. 211, Brown Dwarfs, ed. E.L. Martin
dc.identifierhttps://arxiv.org/abs/astro-ph/0208014
dc.identifierhttp://arxiv.org/abs/astro-ph/0208014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/4785
dc.subjectAstrophysics
dc.titleParallaxes of Brown Dwarfs at USNO
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