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The physical properties of double degenerate common proper motion binariesSpectral types and spectrophotometry are presented for 21 double degenerate (DD) common proper motion binaries, along with estimates of their colors, absolute visual and bolometric magnitudes, and cooling ages. The oldest pairs in the sample are 9 x 10 to the 9th yr; the differential cooling ages range from 0.01 to 0.84. The median and mean separations of the DD pairs are 426 and 407 Au, respectively, both apparently smaller than the WD+MS values. The average UVW motions and velocity dispersions are significantly larger than the average velocities and dispersions associated with selected samples of single white dwarfs and MS+WD binaries when the latter are restricted to the same color/Mv range as the DD systems. This may be a result of the dynamical inflation of the velocity dispersion of DD systems due to their extremely ancient total stellar ages.
Document ID
19910046654
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sion, Edward M.
(Observatoire Midi-Pyrenees, Toulouse, France; Villanova University PA, United States)
Oswalt, Terry D.
(Florida Institute of Technology Melbourne, United States)
Liebert, James
(Steward Observatory Tucson, AZ, United States)
Hintzen, Paul
(Nevada, University Las Vegas, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1991
Publication Information
Publication: Astronomical Journal
Volume: 101
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
91A31277
Funding Number(s)
CONTRACT_GRANT: NSF AST-88-02687
CONTRACT_GRANT: NSF AST-88-02689
CONTRACT_GRANT: NSF AST-89-18471
Distribution Limits
Public
Copyright
Other

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