The eShel spectrograph: A radial-velocity tool at the wise observatory

M. Engel, S. Shahaf, T. Mazeh

Research output: Contribution to journalArticlepeer-review

Abstract

The eShel, an off-the-shelf, fiber-fed echelle spectrograph (R ≈ 10,000), was installed on the 1 m 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 107 counts, with a precision that can get better than 200 m s-1 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 mV=11. We demonstrate this capability with orbital solutions of two binaries from projects being performed at Wise.

Original languageEnglish
Article number065002
JournalPublications of the Astronomical Society of the Pacific
Volume129
Issue number976
DOIs
StatePublished - 1 Jun 2017

Keywords

  • Binaries: spectroscopic - instrumentation: spectrographs - techniques: radial velocities Online material: color figures

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