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| Paper: |
Spitzer Observations of GD 362 and Other Metal-Rich White Dwarfs |
| Volume: |
372, 15th European Workshop on White Dwarfs |
| Page: |
315 |
| Authors: |
Farihi, J.; Zuckerman, B.; Becklin, E.E.; Jura, M. |
| Abstract: |
A Spitzer IRAC survey of 17 nearby metal-rich white dwarfs, nominally DAZ stars, reveals excess emission from only three targets: G 29−38, GD 362 and G 167−8. Observations of GD362 with all three Spitzer instruments reveals a warm (≈ 1000 K) dust continuum, very strong silicate emission, and the likely presence of cooler (≈ 500 K) dust. While there is a general similarity between the mid-infrared spectral energy distributions of G29−38 and GD362, the IRAC fluxes of G167 − 8 are so far unique among white dwarfs. However, further observations of G167 − 8 are required before the measured excess can be definitely associated with the white dwarf. |
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