Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734108k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #341.08; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Very low mass (<0.2 Msun) He white dwarfs can have a layer of stable hydrogen burning near the surface, and this layer can dramatically alter the structure of such a white dwarf. In the last year, a number of new binary systems containing such objects in short (<12 hr) orbits with more massive white dwarfs have been discovered. Making use of recent calculations of the internal structures of low-mass white dwarfs, we present evolutionary calculations exploring the effects of these white dwarfs on the mass-transfer history of compact double-degenerate binaries. We show that mass transfer starts at a low level when the two white dwarfs are farther apart than would otherwise be found and that the accreted material can burn stably, but that the evolution of the He white dwarf causes the orbital period to initially decrease. Following a period minimum the system grows wider, but that eventual outcome can depend on the masses and temperatures of the component stars.
Bildsten Lars
Kaplan David L. A.
Steinfadt Justin
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