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 is nothing more likely to drive a man mad, than the being unable to get rid of the idea of the distinction between right and wrong, and an obstinate, constitutional preference of the true to the agreeable.”
—William Hazlitt (1778–1830)
“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)
“The stars are distant and unobtrusive, but bright and enduring as our fairest and most memorable experiences.”
—Henry David Thoreau (1817–1862)
“You spotted snakes with double tongue,
Thorny hedgehogs, be not seen.
Newts and blindworms, do no wrong,
Come not near our Fairy Queen.”
—William Shakespeare (1564–1616)