THE BAADE-WESSELINK METHOD AND THE DISTANCES TO RR LYRAE STARS .7. THE FIELD STARS SW ANDROMEDAE AND DX DELPHINI AND A COMPARISON OF RECENT BAADE-WESSELINK ANALYSES

We present new BVK photometry and radial velocities from high-resolution spectroscopy for the metal-rich ([Fe/H] = -0.2) ab-type RR Lyrae star SW Andromedae. We utilize these data, along with previously published optical data, to derive the distance and absolute magnitudes of this star using the infrared surface brightness version of the Baade-Wesselink method. We also analyze the metal-rich ([Fe/H] = -0.2) RR Lyrae variable DX Delphini using the same technique and previously published data. We obtain <M(v)> = 1.10 mag, <M(bol)> = 1.10 mag, and <M(k)> = + 0.10 mag for SW And, and <M(v)> = 0.68 mag, <M(bol)> = 0.69 mag, and <M(k)> = -0.35 mag for DX Del. We compare these results, and the values we derived in previous papers in this series, with the results from three other recent applications of the Baade-Wesselink method, and find that they agree to within 0.10 mag when the appropriate phase intervals are considered. Excluding the highly reddened and highly evolved stars, we derive <M(v)(RR)> = 0.16[Fe/H] + 1.02, <M(bol)(RR)> = 0.21[Fe/H] + 1.04, <M(k)(RR)> = -2.33 log P - 0.88, using weighted least-squares fitting for 18 stars.