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On Methods in Stellar Spectrophotometry nine figures Cecilia H Payne and Frank S Hogg
A Comparison of Line Intensities Derived from Slit and Objective
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abscissae absolute magnitude absorption apertures atoms Aurigae average Balmer series brighter brightness calcium Cepheids cluster College Observatory CIRCULAR color column corresponding Cygni density derived determined deviation difference dispersion distance effect emission epoch exposure fainter Figure galactic gradients Harvard College Observatory hydrogen lines images indicate ionized irregular J. D. Wt Julian Day light curve line depths line grade line intensities luminosity maxima and minima Mean Mag measured meteors method microphotometer tracings nebulae objective prism observed Ordinates parallax Payne Persei photographic magnitudes photometric plates Pleiades proper motions Quadrantids radiant range reduction curve residuals RV Tauri variables scale Scuti spectra spectral class spectrum SS Cygni stars of Class stellar systematic temperature tion values variation velocity visual wave length width