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Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs | C. C. Dahn
; H. C. Harris
; 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
; A. J. Burgasser
; J. E. Gizis
; J. D. Kirkpatrick
; J. Liebert
; I. N. Reid
; | Date: |
3 May 2002 | Journal: | Astron.J. 124 (2002) 1170 | Subject: | astro-ph | Abstract: | Trigonometric parallax determinations are presented for 28 late type dwarfs and brown dwarfs, including eight M dwarfs with spectral types between M7 and M9.5, 17 L dwarfs with spectral types between L0 and L8, and three T dwarfs. Broadband photometry at CCD wavelengths (VRIz) and/or near-IR wavelengths (JHK) are presented for these objects and for 24 additional late-type dwarfs. Supplemented with astrometry and photometry from the literature, including ten L and two T dwarfs with parallaxes established by association with bright, usually HIPPARCOS primaries, this material forms the basis for studying various color-color and color-absolute magnitude relations. The I-J color is a good predictor 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. The combination of zJK colors alone can be used to classify late-M, early-L, and T dwarfs accurately, and to predict their absolute magnitudes, but is less effective at untangling the scatter among mid- and late-L dwarfs. The mean tangential velocity of these objects is found to be slightly less than that for dM stars in the solar neighborhood, consistent with a sample with a mean age of several Gyr. Using colors to estimate bolometric corrections, and models to estimate stellar radii, effective temperatures are derived. The latest L dwarfs are found to have T_eff ~ 1360 K. | Source: | arXiv, astro-ph/0205050 | Services: | Forum | Review | PDF | Favorites |
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