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…
Dwarfs Cooler than “M”: The Definition of Spectral Type “L” Using Discoveries from the 2-Micron All-Sky Survey (2MASS)
- J. Kirkpatrick, I. Reid, M. Skrutskie
- Physics, Geology
- 10 July 1999
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 deg2 of actual 2MASS survey data, we have identified another 20…
The theory of brown dwarfs and extrasolar giant planets
- A. Burrows, W. Hubbard, J. Lunine, J. Liebert
- Physics, Geology
- 22 March 2001
Straddling the traditional realms of the planets and the stars, objects below the edge of the main sequence have such unique properties, and are being discovered in such quantities, that one can…
Atmospheric parameters of field subdwarf B stars
- R. Saffer, P. Bergeron, D. Koester, J. Liebert
- Physics, Geology
- 1 September 1994
High signal-to-noise ratio optical spectrophotometry of a sample of field subluminous B stars drawn largely from the Palomar Green ultraviolet-excess survey is analyzed with a new grid of model…
A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
- D. Eisenstein, J. Liebert, S. Snedden
- Physics, Geology
- 28 June 2006
We present a catalog of 9316 spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey Data Release 4. We have selected the stars through photometric cuts and spectroscopic modeling,…
The Formation Rate and Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey
- J. Liebert, P. Bergeron, J. Holberg
- Physics, Geology
- 29 June 2004
Spectrophotometric observations at high signal-to-noise ratio were obtained of a complete sample of 348 DA white dwarfs from the Palomar Green (PG) Survey. Fits of observed Balmer lines to synthetic…
67 Additional L Dwarfs Discovered by the Two Micron All Sky Survey
- J. Kirkpatrick, I. Reid, Rik J. Williams
- Physics, Geology
- 22 March 2000
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…
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
- J. Gizis, D. Monet, I. Reid, J. Kirkpatrick, J. Liebert, Rik J. Williams
- Physics, Geology
- 26 April 2000
We have combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with Ks < 12. Spectroscopic follow-up observations identify 53 M7–M9.5 dwarfs and seven L dwarfs. The…
The Palomar-Green Catalog of Ultraviolet-Excess Stellar Objects
- R. Green, M. Schmidt, J. Liebert
- Physics
- 1 June 1986
On presente le catalogue qui donne les positions avec une precision de 8'', les magnitudes photographiques B a 0,29 mag pres, les types spectraux, des references et les couleurs de Stromgren. Parmi…
Meeting the Cool Neighbors. V. A 2MASS-Selected Sample of Ultracool Dwarfs
- K. Cruz, I. Reid, J. Liebert, J. Kirkpatrick, P. Lowrance
- Physics
- 24 July 2003
We present the initial results of our effort to create a statistically robust, volume-limited sample of ultracool dwarfs from the Two Micron All Sky Survey Second Incremental Data Release. We are…
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