Wavelength calibration with PMAS at 3.5 m Calar Alto Telescope using a tunable astro-comb
| Autor: | Marina Zajnulina, Mateusz Wysmolek, Andreas Kelz, J.M. Chavez Boggio, M. Rutowska, Domenico Giannone, Hakan Sayinc, C. Sandin, T. Fremberg, Markus Roth, D. Bodenmüller, Benito Moralejo |
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| Rok vydání: | 2018 |
| Předmět: |
Offset (computer science)
media_common.quotation_subject Young stellar object chemistry.chemical_element 01 natural sciences law.invention 010309 optics Telescope Neon Optics law 0103 physical sciences Emission spectrum Electrical and Electronic Engineering Physical and Theoretical Chemistry 010303 astronomy & astrophysics Spectrograph media_common Physics business.industry Laser Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry Sky business |
| Zdroj: | Optics Communications. 415:186-193 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2018.01.007 |
| Popis: | On-sky tests conducted with an astro-comb using the Potsdam Multi-Aperture Spectrograph (PMAS) at the 3.5 m Calar Alto Telescope are reported. The proposed astro-comb approach is based on cascaded four-wave mixing between two lasers propagating through dispersion optimized nonlinear fibers. This approach allows for a line spacing that can be continuously tuned over a broad range (from tens of GHz to beyond 1 THz) making it suitable for calibration of low- medium- and high-resolution spectrographs. The astro-comb provides 300 calibration lines and his line-spacing is tracked with a wavemeter having 0.3 pm absolute accuracy. First, we assess the accuracy of Neon calibration by measuring the astro-comb lines with (Neon calibrated) PMAS. The results are compared with expected line positions from wavemeter measurement showing an offset of ∼ 5–20 pm (4%–16% of one resolution element). This might be the footprint of the accuracy limits from actual Neon calibration. Then, the astro-comb performance as a calibrator is assessed through measurements of the Ca triplet from stellar objects HD3765 and HD219538 as well as with the sky line spectrum, showing the advantage of the proposed astro-comb for wavelength calibration at any resolution. |
| Databáze: | OpenAIRE |
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