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We present theoretical models for the formation and evolution of populationsof low-mass X-ray binaries (LMXB) in the two elliptical galaxies NGC 3379 andNGC 4278. The models are calculated with the recently updated StarTrack code(Belczynski et al., 2006), assuming only a primordial galactic field LMXBpopulation. StarTrack is an advanced population synthesis code that has beentested and calibrated using detailed binary star calculations and incorporatesall the important physical processes of binary evolution. The simulations aretargeted to modeling and understanding the origin of the X-ray luminosityfunctions (XLF) of point sources in these galaxies. For the first time weexplore the population XLF down to luminosities of 3X10^36 erg/s, as probed bythe most recent observational results (Kim et al., 2006). We consider modelsfor the formation and evolution of LMXBs in galactic fields with different CEefficiencies, stellar wind prescriptions, magnetic braking laws and initialmass functions. We identify models that produce an XLF in excellent agreementwith the observations both in shape and absolute normalization. We also findthat the treatment of the outburst luminosity of transient systems remains acrucial factor for the determination of the XLF since the modeled populationsare dominated by transient X-ray systems.

Models for Low-Mass X-Ray Binaries in the Elliptical Galaxies NGC3379 and NGC4278: Comparison with Observations