NASA NTRS · 19890024265
L151-81A/B - A unique white dwarf binary with DB and DA components
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.
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Oswalt, Terry D., Hintzen, Paul M., Liebert, James W., Sion, Edward M.. 1988-10-15. L151-81A/B - A unique white dwarf binary with DB and DA components. https://ntrs.nasa.gov/citations/19890024265
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