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In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower the color index, the more blue (or hotter) the object is. Conversely, the larger the color index, the more red (or cooler) the object is.
Effective temperature of a black body compared with the B−V and U−B color index of main sequence and supergiant stars in what is called a color-color diagram. [1] Stars emit less ultraviolet radiation than a black body with the same B−V index. Although stars are not perfect blackbodies, to first order the spectra of light emitted by stars ...
The star is one component of a close double, the other being HD 56578 which on its own would be a faint naked-eye star. The two are separated by 27 ″ . [ 15 ] The two stars appear to be unrelated and the close alignment accidental, with HD 56578 being a much closer and less luminous Am star .
For the cooler stars, dwarfs such as red dwarfs, orange dwarfs, and yellow dwarfs are indeed much smaller and dimmer than other stars of those colors. However, for hotter blue and white stars, the difference in size and brightness between so-called "dwarf" stars that are on the main sequence and so-called "giant" stars that are not, becomes ...
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A K-type main-sequence star, also referred to as a K-type dwarf, or orange dwarf, is a main-sequence (hydrogen-burning) star of spectral type K and luminosity class V. These stars are intermediate in size between red M-type main-sequence stars ("red dwarfs") and yellow/white G-type main-sequence stars .
Timelapse footage captured by German astronaut Alexander Gerst on the International Space Station shows the Russian spacecraft Soyuz MS-11 soaring out of Earth’s atmosphere on December 3.The ...
On Wednesday, December 4, stargazers are in for a treat as the two brightest objects in the sky, Venus and the moon, will appear close together, according to Space.com.