The Story of the Stars Simply Told for General Readers: Simply Told for ...
The Story of the Stars Simply Told for General Readers: Simply Told for ...
George F George Frederick Chambers
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48m. 17 Aquilae and /3 Lyrae may also be mentioned as short- period variables, which on that account, and because they are visible to the naked eye, are specially suitable for ob- servation by amateurs in England. 17 Aquilae varies from about mag. 3^ to mag. 4i in a period of about 7d. 4h. 14m., but this period itself seems variable. The star is yellow in colour and yields a spec- trum of Secchi's Ilnd Type. j8 Lyrae is remarkable as having a double maximum and a double minimum, which together ...make up a main period of I2d. 2ih. 47m. The variations take the follow- ing form : — Starting from a maximum when the star is of mag. 3l, it descends to its first minimum of mag. 4 ; it then rises to the same maximum as before, but in descend- ing to the next minimum it goes down to mag. 4i. Arge- lander ascertained that ^ Lyrae resembles Mira Ceti as regards the circumstances of its period — in other words, that its period is itself vjiriable; that down to 1840 the period was increasing, but that after 1840 it began to de- crease, and was decreasing at the time when Argelander made this remark in 1866.
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