Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19713002n&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #130.02; Bulletin of the American Astronomical Society, Vol. 33, p.714
Astronomy and Astrophysics
Astronomy
Scientific paper
We investigate the progenitor evolution of close binary systems containing double degenerate components. Specifically, these include: (i) He dwarf/CO dwarf binaries; and, (ii) He dwarf/neutron star systems. We follow the evolution of the primordial binaries from the formation of the compact object to the final end state of the binary system. We assume that the mass-transfer phase is completely non-conservative and that the mass lost from the system carries away the specific angular momentum of the compact object (i.e., rapid systemic mass loss). Angular momentum dissipation also occurs as a result of magnetic braking and gravitational radiation reaction. We calculate the evolution of these systems for a wide variety of initial conditions including metallicity (from very metal rich to extremely metal poor), the initial mass of the donor, and the degree of evolution of the donor at the onset of mass loss. We quantitatively delineate the rather sharp bifurcation that occurs wherein: (i) the binary ultimately evolves to become a detached system containing a low-mass ( ~ 0.1 - 0.45 Msun) He dwarf; or, (ii) continues to evolve in a mass-losing state until it has reached an extremely short orbital period (< 30 minutes) and the donor has attained a very low mass (< 0.05 Msun). In the former case, we evaluate the properties of the young (newly detached) He dwarf including the mass of the object itself, its thermal profile and the mass of its H-rich shell. We also examine the conditions that lead to strong (hydrogen) thermonuclear flashes during the collapse of the donor's H-rich envelope just after the cessation of mass loss.
Dubeau Ernest
Lago P.
MacCannell K.
Nelson Lorne Archie
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