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In this work we extend our dynamical study of Ultra Compact X-ray Binaries(UCXB) 4U 1820-30 from Prodan and Murray 2012 to three more UCXBs in globularclusters: 4U 1850-087, 4U 0513-40 and M15 X-2. These three UCXBs have orbitalperiods < 20 mins. Two of them, 4U 1850-087 and 4U 0513-40, have suspectedluminosity variations of order of ~ 1yr. There is insufficient observationaldata to make any statements regarding the long periodicity in the light curveof M15 X-2 at this point. The properties of these three systems are quitesimilar to 4U 1820-30, which prompt us to model their dynamics in the samemanner. As in the case of 4U 1820-30, we interpret the suspected long periodsas the period of small oscillations around a stable fixed point in the Kozairesonance. We provide a lower limit on the tidal dissipation factor Q which isin agreement with results obtained for the case of 4U 1820-30.

On the Dynamics of Ultra Compact X-ray Binaries: 4U 1850-087, 4U 0513-40 and M15 X-2