The Digitization of Photographic Spectra in the Dominion Astrophysical Observatory Plate Collection with Commercial Scanners: A Pilot Study

TL;DR

This pilot study evaluates the effectiveness of commercial flatbed scanners, specifically Epson models, in digitizing photographic spectra from the DAO collection, demonstrating promising results for spectral feature recovery.

Contribution

It demonstrates that commercial scanners can effectively digitize photographic spectra, providing a quick and efficient alternative to traditional methods, with detailed analysis of scanner performance and spectral fidelity.

Findings

Epson 12000XL scanner has superior modulation transfer function.

Moderately weak spectral features are faithfully recovered.

Full plate scanning is crucial for accurate spectral data.

Abstract

Commercial flatbed scanners have the potential to deliver a quick and efficient means of capturing the scientific content of spectra recorded on photographic plates. We discuss the digitization of selected spectra in the Dominion Astrophysical Observatory (DAO) photographic plate collection with commercial scanners. In this pilot study, emphasis is placed on assessing if the information on the plates can be recovered using Epson V800 and 12000XL scanners; the more complicated issues associated with the shortcomings of photographic materials, such as correcting for nonlinearity, are deferred to a future study. Spectra of Vega that were recorded over ~4 decades with the DAO 1.8 meter telescope are examined. These spectra sample a range of photographic emulsions, plate preparation techniques, calibration information, observing techniques, and spectrograph configuration. A scanning density of 2400 elements per inch recovers information in the spectra. Differences in the modulation transfer function (MTF) of the two scanners are found, with the Epson 12000XL having a superior MTF. Comparisons with a CCD spectrum of Vega confirm that moderately weak features are faithfully recovered in photographic spectra that have been digitized with the 12000XL scanner. The importance of scanning the full plate to cover the light profile of the target and calibration information is emphasized. Lessons learned from these experiments are also presented.