Close Pair - A binary system in which the two stars are close enough together that they transfer matter to one another during some stages of their evolution
Cloud Core - The dense part of molecular cloud where star formation takes place ...
Even when the colors are fairly similar, the eye enhances them, rendering close pairs like second magnitude Algieba (Leo's Gamma star) still quite lovely, some observers seeing them as orange and yellow, others yellow and greenish.
Equulei, 13 Ceti and Pegasi are all extremely close pairs, and can only be resolved with the most powerful instruments.
The period of the close pair is 59.7 years. The separation between the stars is appearing to widen and will reach its maximum in 2020.
In these systems stars are grouped into relatively close pairs with more distant single companions. For example, the Alpha Centauri system is a pair of stars with Proxima a more distant companion.
Other notable stars are [2878] gamma Coronae Australis, a binary consisting of a close pair of F8 main sequence stars, kappa Coronae Australis, an [2908] A0 giant with a [2894] B9 main sequence star for a companion, ...
The two most luminous stars, seen in this image as a very close pair near the center of the image, emit a lot of ultraviolet radiation, causing the nebula to fluoresce - glow.
"This is a very nice confirmation of theoretical predictions," he says. "These close pairs are a missing link between the wide binary systems seen previously and the merging black-hole pairs at even smaller separations that we believe must be there." ...
Systems in which this is the case, known as spectroscopic binaries, consist of relatively close pairs of stars where the spectral lines in the light from each one shifts first toward the blue, then toward the red, as it moves first toward us, ...
This edge-on spiral galaxy is, contrary to its name, easy to find right in the middle of a quite close pair of magnitude 7 stars about 3°10' SW of r Virginis (see Virgo Cluster Map and the detailed chart below).
After that the two move through the stars as a close pair with Venus slightly lower until May 20 when they are again at the same level. After this Mercury drops below Venus and with the distance between them increasing more rapidly.
clusters confirm the existence of dark matter and increase the estimated total in galaxies and clusters to ~ 0.1 - 0.2. Similar results follow from the cosmic virial theorem, a statistical method based on the relative velocities of all close pairs of ...
 See also: Solar, Sun, Magnitude, Orbit, Distance
  
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