The eShel Spectrograph: A Radial-velocity Tool at the Wise Observatory
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 m V = 11. We demonstrate this capability with orbital solutions of two binaries from projects being performed at Wise.
- Publication:
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Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 2017
- DOI:
- 10.1088/1538-3873/aa65c6
- arXiv:
- arXiv:1703.09937
- Bibcode:
- 2017PASP..129f5002E
- Keywords:
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- Astrophysics - Instrumentation and Methods for Astrophysics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 30 pages, 12 figures. Accepted for publication in PASP