Word: spectra
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...method of determining parallaxes which may be applied to the more remote stars and which unlocks great possibilities for a study of stellar distances from the hundreds of plates in the photographic library of the Harvard Observatory. The newer method rests upon careful interpretation of small differences in the spectra of stars. A systematic study shows a definite relation between the actual iuminosity or radiating power of known stars of certain classes and the relative intensity of the absorbtion lines in their spectra...
...Harvard Observatory is peculiarly fortunate in having the large collection of plates of the Henry Draper Memorial, from which the spectra of 225,000 stars distributed over the entire sky have been catalogued by Miss Cannon, curator of astronomical photographs. Many of these plates were made at the South American station of the Observatory, and afford valuable material for the determination of the "spectroscopic parallax" by the Mount Wilson method, as there is a great paucity of data concerning stars in the Southern hemisphere. Professor Shapley, Director of the Observatory, has just recently published in Circulars...
...special work of the Observatory, developed under Professor Pickering, who served as its director for 42 years and was instrumental in giving it its present standing in the astronomical world, has dealt with the collection of data on the brightness of the stars, the spectra of the stars, the variable stars, and the globular clusters...
...mathematics and astronomy conferred on her distinguished astronomer, "Miss Annie J. Cannon, by the University of Groningen. How much "gray matter" could have been missing from the brain of the woman who discovered three new luminaries in the sky, added 150 "variables" to the celestial map, and catalogued the spectra of 220,000 stars in all parts of the heavens? --Boston Herald...
Miss Cannon has long been regarded as a leading American woman astronomer. She was graduated from Wellesley in 1884, and has been associated with the Harvard Observatory since 1897. During this time she has completed a monumental catalogue of the spectra of some 220,000 stars all over the heavens, which when published will occupy nine quarto volumes. No such comprehensive study has ever been made before. She has also discovered three new stars, and 150 variable stars, and has completed a bibliography of variable stars containing about 45,000 references...