On the formation of neon-enriched donor stars in ultracompact X-ray binaries

Abstract

We study the formation of neon-enriched donor stars in ultracompact X-ray binaries (orbital periods P<80 min) and show that their progenitors have to be low-mass (0.3 - 0.4 solar mass) ``hybrid'' white dwarfs (with CO cores and thick helium mantles). Stable mass transfer is possible if in the initial stages of mass exchange mass is lost from the system, taking away the specific orbital angular momentum of the accretor (``isotropic re-emission''). The excess of neon in the transferred matter is due to chemical fractionation of the white dwarf which has to occur prior to the Roche lobe overflow by the donor. The estimated lower limit of the orbital periods of the systems with neon-enriched donors is close to 10 min. We show that the X-ray pulsar 4U 1626-67, which likely also has a neon-enriched companion, may have been formed via accretion induced collapse of an oxygen-neon white dwarf accretor if the donor was a hybrid white dwarf.

6 pages, 3 figures, uses aa.cls 5.1 version class file, accepted for publication in Astronomy and Astrophysics

References in corpus (6)

• The gravitational wave signal from the Galactic disk population of binaries containing two compact objects
• Carbon Flashes in the Heavy Element Ocean on Accreting Neutron Stars
• Ultracompact X-Ray Binaries with Neon-Rich Degenerate Donors
• Double-Peaked X-Ray Lines from the Oxygen/Neon-Rich Accretion Disk in 4U1626-67
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