LOTUS: A low cost, ultraviolet spectrograph
| Autor: | Steele, I. A., Marchant, J. M., Jermak, H. E., Barnsley, R. M., Bates, S. D., Clay, N. R., Fitzsimmons, A., Jehin, E., Jones, G., Mottram, C. J., Smith, R. J., Snodgrass, C., de Val-Borro, M. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1093/mnras/stw1287 |
| Popis: | We describe the design, construction and commissioning of LOTUS; a simple, low-cost long-slit spectrograph for the Liverpool Telescope. The design is optimized for near-UV and visible wavelengths and uses all transmitting optics. It exploits the instrument focal plane field curvature to partially correct axial chromatic aberration. A stepped slit provides narrow (2.5x95 arcsec) and wide (5x25 arcsec) options that are optimized for spectral resolution and flux calibration respectively. On sky testing shows a wavelength range of 3200-6300 Angstroms with a peak system throughput (including detector quantum efficiency) of 15 per cent and wavelength dependant spectral resolution of R=225-430. By repeated observations of the symbiotic emission line star AG Peg we demonstrate the wavelength stability of the system is less than 2 Angstroms rms and is limited by the positioning of the object in the slit. The spectrograph is now in routine operation monitoring the activity of comet 67P/Churyumov-Gerasimenko during its current post-perihelion apparition. Comment: Accepted for publication in MNRAS. 10 pages. 14 figures |
| Databáze: | arXiv |
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