Template RR Lyrae H alpha, H beta, and H gamma Velocity Curves
arXiv:1208.1997 · doi:10.1088/0004-6256/144/4/114
Abstract
We present template radial velocity curves of $ab$-type RR Lyrae stars constructed from high-precision measurements of ${\rm Hα}$, ${\rm Hβ}$, and ${\rm Hγ}$ 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).
10 pages, 3 figures, accepted to AJ