Statistics
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005noao.prop..424k&link_type=abstract
NOAO Proposal ID #2005B-0424
Statistics
Scientific paper
We propose to obtain JHK photometry of 30 spectroscopically confirmed new cool white dwarfs, including 8 ultra-cool white dwarf candidates (T_eff<=4000 K), to determine temperatures, bolometric luminosities, and compositions for these stars. Our follow- up spectroscopy of high proper motion objects in the Sloan Digital Sky Survey yielded a large number of new cool white dwarfs which are suitable for constructing an improved white dwarf luminosity function. This luminosity function will ultimately resolve the controversies, based for the most part on small number statistics, of the age of the Galactic disk. The detailed shape of the white dwarf luminosity function will also allow us to constrain the interior physics of cooling white dwarfs and place white dwarf cosmochronometry on a firmer foundation. We have already begun an observing campaign at the IRTF. With the Gemini-NIRI, our goal is to obtain the infrared photometry of the coolest white dwarfs in the Galactic disk that are intrinsically faint and need 8m class telescope observations. These observations will also improve our understanding of the collisionally-induced absorption and other unrecognized opacities in the cool white dwarf atmospheres.
Farihi Jay
Harris Hugh
Hippel Ted von
Kilic Mukremin
Leggett Sandy
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