The eShel Spectrograph: A Radial-velocity Tool at the Wise Observatory

Abstract

The eShel, an off-the-shelf, fiber-fed echelle spectrograph ($R\approx 10,000$), was installed on the 1m telescope at the Wise observatory in Israel. We report the installation of the multi-order spectrograph, and describe our pipeline to extract stellar radial velocity from the obtained spectra. We also introduce a new algorithm---UNICOR, to remove radial-velocity systematics that can appear in some of the observed orders. We show that the system performance is close to the photon-noise limit for exposures with more than $10^7$ counts, with a precision that can get better than 200 m/s for F--K stars, for which the eShel spectral response is optimal. This makes the eShel at Wise a useful tool for studying spectroscopic binaries brighter than $m_V=11$. We demonstrate this capability with orbital solutions of two binaries from projects being performed at Wise.

30 pages, 12 figures. Accepted for publication in PASP

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• BEER analysis of Kepler and CoRoT light curves. V. eBEER: Extension of the Algorithm to Eccentric Binaries
• SB 796: a high-velocity RRc star
• Commissioning an Inexpensive Off-the-shelf Spectrograph for Radial-Velocity Studies