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Three Double Degenerate Candidates

Published online by Cambridge University Press:  12 April 2016

Diana Foss
Diana Foss*
Affiliation:
Steward Observatory, University of Arizona Tucson, AZ, 85721USA

Extract

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This poster reports the results of a search for variable radial velocities in 29 DA white dwarfs. The survey was sensitive to periods between 1h and 66d, although non-ideal sampling limited the longest practically detectable period to 2d. Three stars were discovered to have radial velocity shifts at above the 3σ level. The discovery of these stars, along with that of Saffer, et al. (1988) can put only a lower limit on the space density of close binary white dwarfs, as this survey was less than 100% efficient in detecting radial velocity variations, and its efficiency depended strongly on period.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 114: White Dwarfs , 1989 , pp. 163 - 166
Copyright
Copyright © Springer-Verlag 1989

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