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2017PASP..129f5002E - Publ. Astron. Soc. Pac., 129, part no 6, 5002-65002 (2017/June-0)

The eShel spectrograph: a radial-velocity tool at the Wise observatory.

ENGEL M., SHAHAF S. and MAZEH T.

Abstract (from CDS):

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.

Abstract Copyright: © 2017. The Astronomical Society of the Pacific. All rights reserved.

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