C. Dahn

Publications114
h-index32
Citations5,293
Highly Influential Citations669
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Dwarfs Cooler Than M: The Definition of Spectral Type L Using Discoveries from the 2-Micron All-Sky Survey (2MASS)
Before the 2-Micron All-Sky Survey (2MASS) began, only six objects were known with spectral types later than M9.5 V. In the first 371 sq. deg. of actual 2MASS survey data, we have identified another… Expand
Astrometry and photometry for cool dwarfs and brown dwarfs
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… Expand
67 Additional L Dwarfs Discovered by the Two Micron All Sky Survey
We present JHKs photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey. One of the goals of this new search was to locate… Expand
Infrared Spectra of Low-Mass Stars: Toward a Temperature Scale for Red Dwarfs
We present new low-resolution (R ~ 250) 1.0-2.4 pm spectra for 13 red dwarf stars. The sample size is increased to 16 by including other published infrared spectra. New, as well as published, red… Expand
U.S. Naval Observatory CCD parallaxes of faint stars. I - Program description and first results
The U.S. Naval Observatory CCD trigonometric parallax program is described in detail, including the instrumentation employed, observing procedures followed, and reduction procedures applied.… Expand
The spectra of t dwarfs I: near-infrared data and spectral classification
We present near-infrared spectra for a sample of T dwarfs, including 11 new discoveries made using the 2 Micron All Sky Survey. These objects are distinguished from warmer (L-type) brown dwarfs by… Expand
High-Resolution Spectroscopy of Ultracool M Dwarfs
We present high-resolution echelle spectroscopy of 39 dwarfs with spectral types between M6.5 and L0.5. With one exception, those dwarfs were selected from the Two Micron All Sky Survey database… Expand
L Dwarfs and the Substellar Mass Function
Analysis of initial observations sky surveys has shown that the resulting photometric catalogs, combined with far-red optical data, provide an extremely effective method of finding isolated, very… Expand
The Luminosity Function of White Dwarfs
Trigonometric parallaxes, optical colors, and spectrophotometry are used to derive an empirical luminosity function for cool white dwarfs using the 1/V(max) method. To facilitate comparison with… Expand
Summary of U.S. Naval Observatory parallaxes
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