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High Resolution Spectral Atlas of Arcturus, 0.9-5.3 microns (1Sep95) (from KPNO, NOAO Newsletter No. 43, September 1995) An atlas of the infrared spectrum of the bright K2 giant Arcturus has been completed using the FTS at the 4-m Mayall telescope. The 0.9-5.3u m spectrum of Arcturus was observed at high signal-to-noise with a resolution of 100,000. Telluric lines were removed by using telluric transmission spectra generated from McMath-Pierce solar spectra or 4-m lunar spectra. Arcturus was observed on two different dates selected to give large opposite heliocentric shifts. These spectra were independently corrected for telluric absorption to effectively remove the telluric spectrum from all but the most obscured wavelengths of the Arcturus spectrum. We have identified most lines with central depths stronger than a few percent. This atlas is intended to serve as a guide for future high resolution infrared observations taken at NOAO with the new Phoenix spectrograph or with similar instrumentation at other observatories. While the new generation of infrared spectrographs is much more sensitive than the FTS, the spectral coverage of a single observation is much less. The atlas will be available in the next few months as both a AAS CD-ROM (PASP in press) and an ASP monograph (in press). Until the CD-ROM is released the atlas will be available as an electronic preprint on the anonymous ftp area of the NOAO computer gemini (IP 140.252.1.11) in the subdirectory /pub/arcturus. [Figure not included] One page of more than 300 of the Atlas. The bottom panel shows the observed Arcturus spectrum on one date with the derived atmospheric transmission spectrum for this spectrum above it. The upper panel shows the ratio of the Arcturus spectrum to the transmission spectrum. In the upper panel the observations from two dates at different heliocentric shifts are overplotted with the Arcturus features shifted to laboratory rest frequencies. Note the many very weak features that repeat in both observations. Kenneth Hinkle, Lloyd Wallace, William Livingston
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