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The blue suffix (e.g. L3blue) indicates unusual blue near-infrared colors for L-dwarfs without obvious low metallicity. [ 117 ] Young brown dwarfs have low surface gravities because they have larger radii and lower masses compared to the field stars of similar spectral type.
Rigel is an intrinsic variable star with an apparent magnitude ranging from 0.05 to 0.18. [5] It is typically the seventh-brightest star in the celestial sphere, excluding the Sun, although occasionally fainter than Betelgeuse. [30] Rigel appears slightly blue-white and has a B-V color index of −0.06. [32] It contrasts strongly with reddish ...
In astronomy, a blue giant is a hot star with a luminosity class of III or II (bright giant). In the standard Hertzsprung–Russell diagram , these stars lie above and to the right of the main sequence .
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.
A blue supergiant (BSG) is a hot, luminous star, often referred to as an OB supergiant. They are usually considered to be those with luminosity class I and spectral class B9 or earlier, [ 1 ] although sometimes A-class supergiants are also deemed blue supergiants.
A B-type main-sequence star (B V) is a main-sequence (hydrogen-burning) star of spectral type B and luminosity class V. These stars have from 2 to 16 times the mass of the Sun and surface temperatures between 10,000 and 30,000 K. [1] B-type stars are extremely luminous and blue.
The Pistol Star (or V4647 Sagittarii) is an extremely luminous blue hypergiant star, one of the most luminous and massive known stars in the Milky Way. It is one of many massive young stars in the Quintuplet cluster in the Galactic Center region. The star owes its name to the shape of the Pistol Nebula, which it illuminates.
However, in a telescope it resolves into a double star consisting of β Cygni A (amber, apparent magnitude 3.1), and β Cygni B (blue-green, apparent magnitude 5.1). [34] Separated by 35 seconds of arc, [13] the two components provide one of the best contrasting double stars in the sky due to their different colors.