Round the year with the stars: The chief beauties of the starry heavens as seen with the naked eyeServiss, Garrett Putman
Science
Round the year with the stars: The chief beauties of the starry heavens as seen with the naked eye
Serviss, Garrett Putman
Astronomy -- Popular works
Westward from Cassiopeia, directly over the pole, and lying athwart the
meridian, is the constellation of Cepheus, the King, less conspicuous
than that of his queen, Cassiopeia, but equally ancient. Its leading
star, Alpha (α), also called Alderamin, the “Right Arm,” is a
candidate for the great office of Pole-star, which it will occupy in
about 5500 years. Beta (β), the second in rank, is named Alfirk, the
“Flock” or “Herd.” If you are sweeping here with an opera-glass you
will perceive, about half-way between Alpha (α) and Zeta (ζ), a small
star which will at once arrest your attention by its color. It is the
celebrated “Garnet Star” of Sir William Herschel, who was greatly
impressed by its brilliant hue, declaring it to be the most deeply
colored star that the naked eye can find in the sky. But its color is
not so striking unless a glass be used.
Low down in the north-northwest we see the Great Dipper, above it the
coiling form and diamond head of Draco, and then, still higher, the
Northern Cross and Vega, bright as a jewel. Hercules and the Northern
Crown are near setting in the northwest.
FOOTNOTES:
[1] The reader who is curious concerning such matters is advised
to consult a paper by Dr. Louis Bell on “Star Colors,” in the
_Astrophysical Journal_ (vol. xxi, No. 3, April, 1910). Dr. Bell’s
experiments with artificial stars seem to show that physiological
effects play a great part in producing the pronounced colors of the
small stars in many telescopic doubles. The paper is very interesting,
especially in its description of a startling imitation of the singular
cluster, Kappa (κ) Crucis, which Sir John Herschel described as
resembling a gorgeous piece of colored jewelry. But, whatever part
physiological optics may play in the phenomena of colored doubles, it
is certain that many single stars, including some of great magnitude,
possess distinctive tints. Compare, for instance, Castor and Pollux or
Rigel and Betelgeuse. Aldebaran and Betelgeuse are both reddish, yet
the color tones that they exhibit are clearly different.
IV
THE EVENING SKY AT THE WINTER SOLSTICE
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