Word: hydrogen
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Dates: during 1890-1899
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...most complete set that exists. The six-inch telescope has been used for observing the variable stars and investigating photometric methods of observation. From the photographs taken in Peru it has been discovered that eight variable stars, in addition to the thirty previously noticed ones, have hydrogen lines, bright in their spectra, and by this property, five new variable stars have been discovered. The number of stars of the fifth type, having bright lines in their spectra, like those discovered by Wolf and Rayet, has been increased by nine. Of the thirty seven of the kind, twenty-seven have been...