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We saw that this can be detected on the superficial test of colour. The colours of the stars are, it is true, an unsafe ground to build upon. The astronomer still puzzles over the gorgeous colours he finds at times, especially in double stars: the topaz and azure companions in beta Cygni, the emerald and red of alpha Herculis, the yellow and rose of eta Cassiopeiae, and so on.
It was published as an appendix in the Châtiments, with a remark about the union of two geniuses, the fusion of the verse of a great poet with the admirable verse of a great musician. And the poet would have Mme. Drouet play this marvellous music on the piano from time to time! Tristia Herculis!
The average speed of the Potsdam stars came out only 10·4 miles a second, the quickest among them being Aldebaran, with a recession of thirty miles a second. More lately, however, Deslandres and Campbell have determined for Zeta Herculis and Eta Cephei respectively approaching rates of forty-four and fifty-four miles a second.
The same thing also is confirmed by the name of an head of land in Britaine called Promontorium Herculis, as in Ptolomie ye may read, which is thought to take name of his arriuall at that place. Thus much for Albion and Hercules.
Between the white stars, such as Sirius and Rigel, and the red stars, such as Aldebaran and Alpha Herculis, there is a progressive series of colors from golden yellow through orange to deep red. The change is believed to be due to the increase of absorbing vapors in the stellar atmosphere as the body cools down.
One of the most beautiful of double stars is alpha Herculis. The magnitudes are three and six, distance 4.7", p. 118°, colors orange and green, very distinct. Variability has been ascribed to each of the stars in turn. It is not known that they constitute a binary system, because no certain evidence of motion has been obtained.
On the Periodical Star a Herculis, with Remarks tending to establish the Rotatory Motion of the Stars on their Axes; to which is added a second Catalogue of the Brightness of the Stars. Phil. Trans., vol. lxxxvii.
Thus doing, your name shall flourish in the printers' shops; thus doing, you shall be of kin to many a poetical preface; thus doing, you shall be most fair, most rich, most wise, most all, you shall dwell upon superlatives. Thus doing, though you be libertino patre natus, you shall suddenly grow Herculis proles: Si quid mea carmina possunt.
Out of the goodly pile I selected some half-dozen that bore my name; but I was greatly surprised to come across one that had made a very bad shot for its destination. It bore the simple name of some poor Jacktar, with the address "H.M.S. Hercules." The Romans had their établissement here. The present name comes from the "Thermæ Herculis" of classic times.
The changeable star in the Whale was not the only periodical star with which Herschel occupied himself. His observations of 1795 and of 1796 proved that a Herculis also belongs to the category of variable stars, and that the time requisite for the accomplishment of all the changes of intensity, and for the star's return to any given state, was sixty days and a quarter.
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