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Record Details

Record 29 of 779
L151-81A/B - A unique white dwarf binary with DB and DA components
External Online Source: doi:10.1086/185293
Author and Affiliation:
Oswalt, Terry D.(Florida Institute of Technology, Melbourne, United States)
Hintzen, Paul M.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Liebert, James W.(Steward Observatory, Tucson, AZ, United States)
Sion, Edward M.(Villanova University, PA, United States)
Abstract: Spectroscopic observations of the wide binary L151-81A/B reveal that both components are white dwarfs with spectral types DB3 and DA4, the first such binary identified in a comprehensive survey of Luyten and Giclas common proper motion pairs. Assuming log g = 8, measurements of the helium line profiles in the DB primary yield Teff = 16,000 + or - 2,000, while the hydrogen profiles for the DA companion yield Teff =12,000 + or - 2,000. The existence of a helium-rich/hydrogen-rich degenerate pair offers several interesting tests of theoretical white dwarf formation channels and surface abundance evolution.
Publication Date: Oct 15, 1988
Document ID:
19890024265
(Acquired Nov 28, 1995)
Accession Number: 89A11636
Subject Category: ASTROPHYSICS
Document Type: Journal Article
Publication Information: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 333; L87-L89
Publisher Information: United States
Contract/Grant/Task Num: NSF AST-85-14778; NSF AST-85-17125; NSF AST-88-02689; NSF AST-88-02687
Financial Sponsor: NASA; United States
Organization Source: Florida Inst. of Tech.; Melbourne, FL, United States
NASA Goddard Space Flight Center; Greenbelt, MD, United States
Arizona Univ.; Tucson, AZ, United States
Villanova Univ.; PA, United States
Description: 3p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: ASTRONOMICAL PHOTOGRAPHY; BINARY STARS; SPECTROSCOPIC ANALYSIS; STELLAR MOTIONS; STELLAR SPECTRA; WHITE DWARF STARS; HELIUM; HYDROGEN; SIGNAL TO NOISE RATIOS; SPECTRAL RESOLUTION
Imprint And Other Notes: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. L87-L89. Research supported by the Florida Institute of Technology.
Miscellaneous Notes: Research supported by the Florida Institute of Technology
Availability Source: Other Sources
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