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We present high resolution (R = 60,000) measurements of the NaI D1 and D2(5890 A) and CaII K (3933 A) interstellar absorption line profiles recordedtowards several post-AGB stars located within the M13 and M15 globularclusters, supplemented with a lower resolution spectrum of the CaII K-lineobserved in absorption towards an Ofpe/WN9 star in the central region of theM33 galaxy. The normalized interstellar absorption profiles have been fit withcloud component velocities, doppler widths and column densities in order toinvestigate the kinematics and physical conditions of the neutral and partiallyionized gas observed along each sight-line. Our CaII observations towards M13have revealed 4 absorption components that can be identified with galacticIntermediate Velocity Clouds (IVCs) spanning the -50 > Vlsr > -80 km/s range.The NaI/CaII ratio for these IVC's is<0.3, which characterizes the gas as beingwarm (T=1000 K) and partially ionized. Similar observations towards two starswithin M15 have revealed absorption due to a galactic IVC at Vlsr=+65 km/s.This IVC is revealed to have considerable velocity structure, requiring atleast 3 cloud components to fit the observed NaI and CaII profiles. CaII K-lineobservations of a sight-line towards the center of the M33 galaxy have revealedat least 10 cloud components. A cloud at Vlsr=-130 km/s is either an IVCassociated with the M33 galaxy occurring at +45 km/s with respect to the M33local standard of rest, or it is a newly discovered HVC associated with our ownGalaxy. In addition, 4 clouds have been discovered in the -165 > Vlsr > -205km/s range. Three of these clouds are identified with the disk gas of M33,whereas a component at - 203 km/s could be IVC gas in the surrounding halo ofM33.

High resolution NaI and CaII absorption observations towards M13, M15 and M33