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29 March 2024
 
  » arxiv » astro-ph/0205050

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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
AbstractTrigonometric 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
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