Distinction Between Binary Stars and Other Double Stars
Visual double stars may be distinguished from binary stars by observing their relative motion. If the motion is part of an orbit, or if the stars have similar radial velocities or the difference in their proper motions is small compared to their common proper motion, the pair is probably physical. When observed over a short period of time, the components of both optical doubles and long-period visual binaries will appear to be moving in straight lines; for this reason, it can be difficult to distinguish between these two possibilities.
Read more about this topic: Double Star
Famous quotes containing the words distinction between, distinction, stars and/or double:
“The distinction between children and adults, while probably useful for some purposes, is at bottom a specious one, I feel. There are only individual egos, crazy for love.”
—Don Barthelme (1931–1989)
“There appears to be but two grand master passions or movers in the human mind, namely, love and pride. And what constitutes the beauty or deformity of a man’s character is the choice he makes under which banner he determines to enlist himself. But there is a strong distinction between different degress in the same thing and a mixture of two contraries.”
—Sarah Fielding (1710–1768)
“The bay-trees in our country are all withered,
And meteors fright the fixèd stars of heaven.
The pale-faced moon looks bloody on the earth,
And lean-looked prophets whisper fearful change.
Rich men look sad, and ruffians dance and leap;
The one in fear to lose what they enjoy,
The other to enjoy by rage and war.
These signs forerun the death or fall of kings.”
—William Shakespeare (1564–1616)
“[The] elderly and timid single gentleman in Paris ... never drove down the Champs Elysees without expecting an accident, and commonly witnessing one; or found himself in the neighborhood of an official without calculating the chances of a bomb. So long as the rates of progress held good, these bombs would double in force and number every ten years.”
—Henry Brooks Adams (1838–1918)