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We present new K-band spectroscopy of the UY Aur binary star system. Our dataare the first to show H$_{2}$ emission in the spectrum of UY Aur A and thefirst to spectrally resolve the Br{\gamma} line in the spectrum of UY Aur B. Wesee an increase in the strength of the Br{\gamma} line in UY Aur A and adecrease in Br{\gamma} and H$_{2}$ line luminosity for UY Aur B compared toprevious studies. Converting Br{\gamma} line luminosity to accretion rate, weinfer that the accretion rate onto UY Aur A has increased by $2 \times 10^{-9}$M$_{\odot}$ yr$^{-1}$ per year since a rate of zero was observed in 1994. TheBr{\gamma} line strength for UY Aur B has decreased by a factor of 0.54 since1994, but the K-band flux has increased by 0.9 mags since 1998. The veiling ofUY Aur B has also increased significantly. These data evince a much moreluminous disk around UY Aur B. If the lower Br{\gamma} luminosity observed inthe spectrum of UY Aur B indicates an intrinsically smaller accretion rate ontothe star, then UY Aur A now accretes at a higher rate than UY Aur B. However,extinction at small radii or mass pile-up in the circumstellar disk couldexplain decreased Br{\gamma} emission around UY Aur B even when the diskluminosity implies an increased accretion rate. In addition to our scientificresults for the UY Aur system, we discuss a dedicated pipeline we havedeveloped for the reduction of echelle-mode data from the ARIES spectrograph.

Variable Accretion Processes in the Young Binary-Star System UY Aur