Bessel estimates the quantity of matter in the two members of a double star in the Swan, as less than half that of the sun.
Footnote 1442: The "relative orbit" of a double star is that described by one round the other as a fixed point.
A double star of the fourth magnitude in Cassiopeia (Eta), to which a small parallax is ascribed on the authority of O.
See, be found to account for the highly eccentric orbits of double star systems.
In the close neighbourhood of Mizar is the small star Alcor, which can be readily seen with the unaided eye; but when we speak of Mizar as a double star, it is not to be understood that Alcor is one of the components of the double.
The Pole Star (Polaris) is a double star, one of the components being of a little below the second magnitude, and the other a little below the ninth.
A pairing of stars in this way, though often casually alluded to as a double star, is properly termed a "binary," or binary system.
Of the two stars, Castor is the more interesting because it is a double star that is readily separated into two stars with the aid of a small telescope.
It is the finest example in the heavens of a quadruple star--that is, "a double-double star.
If the reader will substitute the words planetary markings for double star in the above quotation from Sir David Gill's report, he will understand why we have ventured to italicise certain lines, and will appreciate their significance.
A primary planet; the brighter component of a double star.
The star [a] Capricorni is plainly double, and a sharp eye can detect that one of the faint stars which with Vega make a small equilateral triangle, is also a double star.
This is a double star, the components being about forty-one seconds of arc apart, the larger of four and one half magnitude, and the smaller of the seventh magnitude.
Sirius, as we saw when talking of Procyon (see Chapter I), is a double star.
We pass to more legitimate observations, noticing in passing that Sirius is a double star, the companion being of the tenth magnitude, and distant about ten seconds from the primary.
Mizar is a double star, and a fourth star is seen in the same field of view with the others (see Plate 5).
Antares is a double star, its companion being a minute green star.
The double-double star [epsilon] Lyræ as seen under three different powers.
Whenever you have a chance of looking at the heavens through a telescope, you should ask to be shown what is called a double star.
Especially is this true in the case of two suns like those forming a double star.
Let us try to conceive our own system transformed into a double star.
I wonder if it couldn't be used to break up a double star?
It's impossible for a planet to be in equilibrium about a double star!
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "double star" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
