hereafter HRS] is a visible light fiber-fed, cross-dispersed, echelle spectrometer located on the 9.2m Hobby-Eberly Telescope [@1998SPIE.3352...34R hereafter HET]. The HET was designed to carry out narrow-field spectroscopy of faint objects, and so is well suited for targets like our [*Kepler*]{} EB sample. The spectrograph is fiber-fed and housed in an isolated enclosure in the HET spectrograph room, which provides a moderately stable environment capable of achieving long-term radial velocity stability of $25{\ensuremath{\mathrm{\,m\,s^{-1}}}}$ on bright, low-mass, main-sequence stars using standard ThAr emission lamps for wavelength calibration [@2012ApJ...751L..31B]. The HET operates under a queue-based observing scheme [@2007PASP..119..556S] that allows us to request observations of a target to occur within a narrow time window. This capability allowed us to efficiently observe 55 members of our EB sample from 2011 – 2013, while targeting each system at specific orbital phases. A similar set of observations could not easily be obtained at a classically scheduled facility, making the HET a unique resource for studying binary stars.

We use the HRS with a 2” fiber in a configuration that provides a spectral resolution of $\lambda / \Delta\lambda=30,000$ over a bandwidth from 4076Å– 7838Å, except a small gap at 5936Å where light falls between the two 