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Excess Infrared Radiation from the Massive DAZ White Dwarf GD 362: A Debris Disk?
We report the discovery of excess K-band radiation from the massive DAZwhite dwarf star GD 362. Combining infrared photometric andspectroscopic observations, we show that the excess radiation cannot beexplained by a stellar or substellar companion, and is likely to becaused by a debris disk. This would be only the second such systemknown, discovered 18 years after G29-38, the only single white dwarfcurrently known to be orbited by circumstellar dust. Both of thesesystems favor a model with accretion from a surrounding debris disk toexplain the metal abundances observed in DAZ white dwarfs. Nevertheless,observations of more DAZs in the mid-infrared are required to test ifthis model can explain all DAZs.Based on observations obtained with the Infrared Telescope Facility,which is operated by the University of Hawaii under CooperativeAgreement NCC 5-538 with the National Aeronautics and SpaceAdministration, Office of Space Science, Planetary Astronomy Program.
| A new list of 617 radial velocities in four galactic fields
Four stellar fields in the -30 deg galactic latitude have been surveyedfor radial velocities, using a 62 cm objective prism. Exact positions,spectral types, and approximate magnitudes are provided for 617 stars infour different 4 x 4 deg fields. B to F4 stars were found which haveGaussian velocity distributions.
| Vitesse radiales dans 4 Selected Areas.
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| Positions et Mouvements propres de 357 Etoiles de Repère de la Zone + 16° à + 18° pour l'époque et l'équinoxe 1950,0
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