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:
“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)
“We are underbred and low-lived and illiterate; and in this respect I confess I do not make any very broad distinction between the illiterateness of my townsman who cannot read at all and the illiterateness of him who has learned to read only what is for children and feeble intellects. We should be as good as the worthies of antiquity, but partly by first knowing how good they were.”
—Henry David Thoreau (1817–1862)
“The sumptuous age of stars and images is reduced to a few artificial tornado effects, pathetic fake buildings, and childish tricks which the crowd pretends to be taken in by to avoid feeling too disappointed. Ghost towns, ghost people. The whole place has the same air of obsolescence about it as Sunset or Hollywood Boulevard.”
—Jean Baudrillard (b. 1929)
“since I see
Your double heart,
Farewell my part!”
—Sir Thomas Wyatt (1503?–1542)