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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.
Not Available
| Positions et Mouvements propres de 357 Etoiles de Repère de la Zone + 16° à + 18° pour l'époque et l'équinoxe 1950,0
Not Available
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Osservazione e dati astrometrici
| Costellazione: | Pegaso |
| Ascensione retta: | 22h10m27.72s |
| Declinazione: | +16°42'29.2" |
| Magnitudine apparente: | 7.727 |
| Distanza: | 187.617 parsec |
| Moto proprio RA: | 17.7 |
| Moto proprio Dec: | -12.3 |
| B-T magnitude: | 7.751 |
| V-T magnitude: | 7.729 |
Cataloghi e designazioni:
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