Ms. Shiomi Nemoto Profile

Shiomi Nemoto

at National Astronomical Observatory of Japan

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Proceedings Article | 26 August 2024 Poster + Paper

Spectrophotometric accuracy of spectra obtained from spectroscopic plates measured with a commercial flatbed scanner

Kenshi Yanagisawa, Reiko Furusho, Shiomi Nemoto, Toshihiro Kasuga, Yumi Iwashita, Jun-ichi Watanabe

Proceedings Volume 13100, 131004J (2024) https://doi.org/10.1117/12.3017980

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The intensity spectra recovered from the spectroscopic photographic plates were compared with the CCD spectra, and we found the difference between the two was 2.5%. The measurements were taken using a commercial flatbed scanner instead of a microdensitometer. The results indicate that the following two statements are inaccurate: (1) Correct measurement of spectroscopic plates requires a microdensitometer, and a commercial flatbed scanner is insufficient; (2) The spectrophotometric accuracy of spectroscopic plate is approximately 10% accurate. These results will encourage the creation and publication of a digital archive of spectroscopic plates. This paper presents the measurement of spectroscopic plates, the method of recovering intensity spectra from photographic density spectra, the results of comparison with CCD spectra, and discusses the causes of the high accuracy spectra obtained with a commercial flatbed scanner.

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