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Liverpool Telescope Technical Note 1: Telescope and IO:O Throughput

Smith, RJ and Steele, IA (2017) Liverpool Telescope Technical Note 1: Telescope and IO:O Throughput. Liverpool John Moores University, Liverpool.

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Abstract

We measure the absolute photon efficiency of the Liverpool Telescope using observations of photometric standard stars and a throughput model of the IO:O instrument. Over a period of 1 year following mirror re-coating the telescope transmission is in the range 73-79% over 4000-10000 Angstroms. Transmission in the u'-band (~3500 Angstroms) is slightly lower at 65%. Immediately following mirror re-coating the throughput is shown to be consistent within 4% to predictions for two reflections from bare-aluminium-coated optics. The telescope throughput (two reflections) degrades at a rate ~0.0002 mag/day. Also presented are the effective wavelengths and widths for the u',g',r',i',z',B,V broad-band filters, taking into account all optical components of the system.

Item Type: Other
Uncontrolled Keywords: Liverpool Telescope
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Liverpool John Moores University
Date Deposited: 22 Feb 2017 09:50
Last Modified: 22 Feb 2017 09:50
DOI or Identification number: 10.6084/m9.figshare.4659421.v1
URI: http://researchonline.ljmu.ac.uk/id/eprint/5699

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