Ultracompact X-ray binaries (UCXBs). Nelemans & Jonker, 2006 Bildsten & Deloye, 2004 Belczynski & Taam, 2003 http://online.kitp.ucsb.edu/online/ultra_c03/ etc. Introduction. UCXBs. Why study UCBs? strong GR sources
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Ultracompact X-ray binaries(UCXBs)
Nelemans & Jonker, 2006
Bildsten & Deloye, 2004
Belczynski & Taam, 2003
Why study UCBs?
Artist’s conception of NS accreting from a WD
Pulse frequency as a function of orbital phase (XTE J1751 -305) Markwardt et al. 2002
Van Paradijs & McClintock,
Ne/O/C emission lines-- another fingerprint of UCXBs?
4U 1626 -67
an oxygen/neon rich accretion disc
(Schulz et al., 2001)
4U 0614 +09,
Carbon-oxygen accretion disc
Origin 1: exchange interaction
Red-white binary enters from right
green enters from left
chaos ensues eventually ejecting white
Belczynski & Taam
Galactic SFR ~ 1-3 /yr (Blitz 1997) or 1~10 /yr (Gilmore 2001).
X-ray duty cycle for transients, 33
CE evolution (α×λ=0.1), 20
IMF (independent secondary), 10
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