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We present a catalog of RR Lyrae stars (RRLs) observed by the Xuyi SchmidtTelescope Photometric Survey (XDSS). The area we consider is located in theNorth Galactic Cap, covering 376.75 sq deg at RA $\approx$ 150 deg and Dec$\approx$ 27 deg down to a magnitude limit of i $\approx$ 19. Using thevariability information afforded by the multi-epoch nature of our XDSS data,combined with colors from the Sloan Digital Sky Survey, we are able to identifycandidate RRLs. We find 318 candidates, derive distances to them and estimatethe detection efficiency. The majority of our candidates have more than 12observations and for these we are able to calculate periods. These also allowsus to estimate our contamination level, which we predict is between 30% to 40%.Finally we use the sample to probe the halo density profile in the 9-49 kpcrange and find that it can be well fitted by a double power law. We find goodagreement between this model and the models derived for the South Galactic Capusing the Watkins et al. (2009) and Sesar et al. (2010) RRL data-sets, afteraccounting for possible contamination in our data-set from Sagittarius streammembers. We consider non-spherical double power law models of the halo densityprofile and again find agreement with literature data-sets, although we havelimited power to constrain the flattening due to our small survey area. Muchtighter constraints will be placed by current and future wide-area surveys,most notably ESA's astrometric Gaia mission. Our analysis demonstrates thatsurveys with a limited number of epochs can effectively be mined for RRLs. Ourcomplete sample is provided as accompanying online material.

RR Lyrae in XSTPS: The halo density profile in the North Galactic Cap