Berry, Arthur,b. 1862 · London, J. Murray · leaf 491
earth are changing regularly and are differ-ent ; hence, if the light from both stars is received in thespectroscope, two spectra are formed—one for each star—the lines of which shift regularly relatively to one another.If a particular line, say the F line, common to the spectraof both stars, is… … §§ 33—316] Stellar Spectroscopy 403 be powerful enough to detect the minute quantity involved,the line will appear doubled, one component being due toone star and one to the other. A periodic doubling ofthis kind was detected at the end of 1889 by ProfessorE. C. Pickering of Harvard in the case of…
Astronomy
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