Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 227
S3, and 5 is at s3 the con-ditions will be reversed. At the intermediate pointswhen S is at S2 or S4, and s at s2 or s4, the starshave no velocity to or from the Earth, and the linesin their spectra will not be displaced from their normalpositions. When the spectrum of a binary star which is… … DOUBLE STARS AND CLUSTERS 217 in which case the spectrum of s will not he recorded.Again, it is possible that S and 5 may be two starsof nearly equal magnitude and similar spectra, inwhich case, owing to the shift of the lines due to themotion of the stars, lines in the spectra will sometimesappear…
Astronomy
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