Period derivative of the M15 X-ray Binary AC211/X2127+119
L. Homer, P. A. Charles
Abstract
We have combined Rossi X-ray Timing Explorer observations of X2127+119, the low-mass X-ray binary in the globular cluster M15, with archival X-ray lightcurves to study the stability of the 17.1 hr orbital period. We find that the data cannot be fit by the Ilovaisky (1993) ephemeris, and requires either a 7sigma change to the period or a period derivative Pdot/P~9x10e-7 per year. Given its remarkably low LX/Lopt such a Pdot lends support to models that require super-Eddington mass transfer in a q~1 binary.
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