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The First Mid-Infrared Spectra of Cool White Dwarfs
Mukremin Kilic, Piotr M. Kowalski, Fergal Mullally +2
We present the first mid-infrared spectra of two cool white dwarfs obtained with the Spitzer Space Telescope. We also present 3.5-8 micron photometry for 19 cool white dwarfs with…
Wide-Field Survey of Globular Clusters in M31. I. A Catalog of New Clusters
Sang Chul Kim, Myung Gyoon Lee, Doug Geisler +6
We present the result of a wide-field survey of globular clusters (GCs) in M31 covering a 3deg x 3deg field c. We have searched for GCs on CCD images taken with Washington CMT1 fil…
The New Class of Dusty DAZ White Dwarfs
Ted von Hippel, Marc J. Kuchner, Mukremin Kilic +2
Our mid-infrared survey of 124 white dwarfs with the Spitzer Space Telescope and the IRAC imager has revealed an infrared excess associated with the white dwarf WD 2115-560 natural…
Discovery of Photospheric Calcium Line Strength Variations in the DAZd White Dwarf G29-38
Ted von Hippel, Susan E. Thompson
Metals in the photospheres of white dwarfs with Teff between 12,000 and 25,000 K should gravitationally settle out of these atmospheres in 1-2 weeks. Temporal variations in the lin…