Correction of near-infrared high-resolution spectra for telluric absorption at 0.90-1.35 microns
| Autor: | Sameshima, Hiroaki, Matsunaga, Noriyuki, Kobayashi, Naoto, Kawakita, Hideyo, Hamano, Satoshi, Ikeda, Yuji, Kondo, Sohei, Fukue, Kei, Taniguchi, Daisuke, Mizumoto, Misaki, Arai, Akira, Otsubo, Shogo, Takenaka, Keiichi, Watase, Ayaka, Asano, Akira, Yasui, Chikako, Izumi, Natsuko, Yoshikawa, Tomohiro |
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| Rok vydání: | 2018 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1538-3873/aac1b4 |
| Popis: | We report a method of correcting a near-infrared (0.90-1.35 $\mu$m) high-resolution ($\lambda/\Delta\lambda\sim28,000$) spectrum for telluric absorption using the corresponding spectrum of a telluric standard star. The proposed method uses an A0\,V star or its analog as a standard star from which on the order of 100 intrinsic stellar lines are carefully removed with the help of a reference synthetic telluric spectrum. We find that this method can also be applied to feature-rich objects having spectra with heavily blended intrinsic stellar and telluric lines and present an application to a G-type giant using this approach. We also develop a new diagnostic method for evaluating the accuracy of telluric correction and use it to demonstrate that our method achieves an accuracy better than 2\% for spectral parts for which the atmospheric transmittance is as low as $\sim$20\% if telluric standard stars are observed under the following conditions: (1) the difference in airmass between the target and the standard is $\lesssim 0.05$; and (2) that in time is less than 1 h. In particular, the time variability of water vapor has a large impact on the accuracy of telluric correction and minimizing the difference in time from that of the telluric standard star is important especially in near-infrared high-resolution spectroscopic observation. Comment: 20 pages, 16 figures, accepted for publication in Publications of the Astronomical Society of the Pacific |
| Databáze: | arXiv |
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