L151-81A/B - A unique white dwarf binary with DB and DA components

Details L151-81A/B - A unique white dwarf binary with DB and DA components L151-81A/B - A unique white dwarf binary with DB and DA components

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333l..87o&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. L87-L89. Research supported by the Florida

Astronomy and Astrophysics

Astrophysics

8

Astronomical Photography, Binary Stars, Spectroscopic Analysis, Stellar Motions, Stellar Spectra, White Dwarf Stars, Helium, Hydrogen, Signal To Noise Ratios, Spectral Resolution

Scientific paper

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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