7 papers
The White Dwarf Luminosity Function: The Shape of Things to Come
T. von Hippel, M. Kilic, J. Munn +10
We describe a new survey for cool white dwarfs that supplements Sloan Digital Sky Survey photometry with USNO proper motions and follow-up spectroscopy. To date we have discovered…
Evolution of Brown Dwarf Atmospheres: Investigating Physical Parameters from Near-IR Spectra
Nadya Gorlova, Michael R. Meyer, Jim Liebert +1
We obtained near-infrared spectra of a sample of very low mass objects as a function of age in order to investigate the temperature and surface gravity sensitivity of several featu…
On the Origin of Subdwarf B Stars and Related Metal-Rich Binaries
Elizabeth M. Green, James Liebert, Rex A. Saffer
Mounting evidence from subdwarf B (sdB) stars in the galactic field and their recently discovered counterparts in old open clusters indicates that at least two thirds of local disk…
Discovery of Four Field Methane (T-type) Dwarfs with 2MASS
A. J. Burgasser, J. D. Kirkpatrick, M. E. Brown +8
We report the discovery of four field methane (T-type) brown dwarfs using 2MASS survey data. One additional methane dwarf, previously discovered by SDSS, was also identified. Near-…
HST Observations of High-Density Globular Clusters
G. Piotto, C. Sosin, I. R. King +6
In this paper we present preliminary results from our HST project aimed at exploring the connection between the stellar dynamics and stellar evolution in the cores of high-density…
Globular Clusters Color-Magnitude Diagrams with HST
C. Sosin, G. Piotto, S. G. Djorgovski +6
In this paper we present the 13 B and V color-magnitude diagrams discussed by Piotto et al. in the same Procedings. The data have been collected with the WFPC2 camera on HST. We em…