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We use data from the Northern Sky Variability Survey (NSVS), obtained fromthe first generation Robotic Optical Transient Search Experiment (ROTSE-I), toidentify and study RR Lyrae variable stars in the solar neighborhood. Weinitially identified 1197 RRab (RR0) candidate stars brighter than the ROTSEmedian magnitude V = 14. Periods, amplitudes, and mean V magnitudes aredetermined for a subset of 1188 RRab stars with well defined light curves.Metallicities are determined for 589 stars by the Fourier parameter method andby the relationship between period, amplitude, and [Fe/H]. We comment upon thedifficulties of clearly classifying RRc (RR1) variables in the NSVS dataset.Distances to the RRab stars are calculated using an adoptedluminosity-metallicity relation with corrections for interstellar extinction.The 589 RRab stars in our final sample are used to study the properties of theRRab population within 5 kpc of the Sun. The Bailey diagram of period versusamplitude shows that the largest component of this sample belongs to Oosterhofftype I. Metal-rich ([Fe/H] > -1) RRab stars appear to be associated with theGalactic disk. Our metal-rich RRab sample may include a thin disk as well as athick disk population, although the uncertainties are too large to establishthis. There is some evidence among the metal-rich RRab stars for a decline inscale height with increasing [Fe/H], as was found by Layden (1995). Thedistribution of RRab stars with -1 < [Fe/H] < -1.25 indicates that within thismetallicity range the RRab stars are a mixture of stars belonging to halo anddisk populations.Comment: 68 pages, 26 figures, 9 tables, accepted to A

Analysis of RR Lyrae Stars in the Northern Sky Variability Survey