[Half-hours with the Telescope by Richard A. Proctor]@TWC D-Link book
Half-hours with the Telescope

CHAPTER III
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In the same field with these are seen many other stars.
The stars [gamma]^{1} and [gamma]^{2} may also be seen in a single field, the distance between them being about half the moon's mean diameter.

The former is quadruple, the components being yellow, bluish, pale blue, and blue.
Turn next to the stars [beta] and [gamma] Lyrae, the former a multiple, the latter an unequal double star.

It is not, however, in these respects that these stars are chiefly interesting, but for their variability.

The variability of [gamma] has not indeed been fully established, though it is certain that, having once been less bright, [gamma] is now considerably brighter than [beta].

The change, however, may be due to the variation of [beta] alone.


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