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arxiv: 1210.5162 · v1 · pith:WIHZ76GHnew · submitted 2012-10-18 · 🌌 astro-ph.HE · astro-ph.SR

Ultra-compact X-ray binaries with high luminosity: a key for a new scenario

classification 🌌 astro-ph.HE astro-ph.SR
keywords binariesx-rayhighratessystemsucxbsultra-compactaccreting
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Ultra-compact X-ray binaries (UCXBs) are accreting systems with periods less than 1 hour, which qualifies them to contain a degenerate donor-companion. One would expect such systems to have the easiest theoretical explanation, compared to other kinds of X-ray binaries. Nonetheless, current theory fails to explain high mass transfer (MT) rates in three recently well observed long-period UCXBs. We find that this range of MT rates can be maintained if the donor is a remnant of an out-of-thermal-equilibrium naked core of a giant which was revealed in a very recent episode of a common envelope (CE) event.

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