We present template radial velocity curves of ab-type RR Lyrae stars constructed from high-precision measurements of Hα, Hβ, and Hγ lines. Amplitude correlations between the Balmer line velocity curves, Johnson V-band, and SDSS g- and r-band light curves are also derived. Compared to previous methods, these templates and derived correlations reduce the uncertainty in measured systemic (center-of-mass) velocities of RR Lyrae stars by up to 15 {\kms}, and will be of particular interest to wide-area spectroscopic surveys such as the Sloan Digital Sky Survey (SDSS) and LAMOST Experiment for Galactic Understanding and Exploration (LEGUE).
@article{arxiv.1208.1997,
title = {Template RR Lyrae H alpha, H beta, and H gamma Velocity Curves},
author = {Branimir Sesar},
journal= {arXiv preprint arXiv:1208.1997},
year = {2015}
}