Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20720503k&link_type=abstract
American Astronomical Society Meeting 207, #205.03; Bulletin of the American Astronomical Society, Vol. 37, p.1503
Other
Scientific paper
We present mid-infrared (4.5μ m and 8μ m) photometric observations of 18 cool white dwarfs obtained with the Spitzer Space Telescope. Our observations demonstrate that four DA white dwarfs with T eff< 7000 K show slightly depressed mid-IR fluxes. In addition, two white dwarfs with peculiar optical and near-IR spectral energy distributions (LHS 1126 and G240-72) are found to display significant flux deficits in the Spitzer observations. These mid-IR flux deficits are not predicted by the current white dwarf models including collision induced absorption due to molecular hydrogen. We show that either the collision induced absorption calculations are incomplete or there are other unrecognized physical processes in cool white dwarf atmospheres. The spectral energy distribution of LHS 1126 surprisingly fits a power law (Rayleigh-Jeans spectrum) in the infrared, which implies that the source of this deficit is probably not molecular absorption but some other process.
Burrows Adam
Hippel Ted von
Kilic Mukremin
Kuchner Marc J.
Mullally Fergal
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