Star Classification: Difference between revisions

Usually type B-0 and measures only a few kilometres in diametre. An early main sequence star that has completed the nuclear burning processes often explodes. The reactive force of the explosion and the starâ⿬⿢s self-gravitation eject shell electrons (as in a white dwarf) and nuclear positrons. This leaves a neutroneum core, possibly covered by a thin degenerate matter shell.  

The red giant phase is common in the evolution of many less massive stars. When core hydrogen is exhausted, gravitational collapse ignites hydrogen shell burning outside the core. The starâ⿬⿢s envelope expands far beyond the photosphere limit. The starâ⿬⿢s atmosphere is relatively cool.  

When a massive young star exhausts its core hydrogen it undergoes second-stage gravitational collapse. The resulting core temperature increase leads to runaway nuclear burning of helium, carbon, nitrogen and an explosion that blasts the starâ⿬⿢s outer layer into space. Supernova explosions are the major source of metals and other galactic elements.  

Primarily degenerate matter, this main sequence star, usually of type G-late A, has completed nuclear burning processes and has collapsed into a configuration roughly the size of a small planet. White dwarfs radiate at various levels of intensity through self-gravitational collapse. Nuclear burning occurs only on the surface through accretion of unburned matter from other sources; in such cases, nuclear ignition can regularily occure and is the source of the â⿬˿recurrent novaâ⿬⿢ effect. The spectral class of white dwarf stars is usually prefixed with a 'D'.  

* 0 â⿬⿿ Violet = White  

* B â⿬⿿ Blue = White  

* F â⿬⿿ Yellow = White  

* G â⿬⿿ Yellow  

* K â⿬⿿ Orange  

* M â⿬⿿ Red  

While a 'Giant' star may have a radius of up to 1,000 times that of Sol and be up to 100,000 times as luminous, most of the stars are in the 'main sequence' portion of their lifetimes and have values near the typical main sequence ones for their type. Sol, Earthâ⿬⿢s sun, is a type G. Its spectrum, as filtered by Earthâ⿬⿢s atmosphere, is the basis for standard illumination in Human quarters.  

* '''Temperature''': 30,000 - 50,000k

* '''Luminosity''': 1,000 â⿬⿿ 100,000 SOL  

* '''Temperature''': 10,000 â⿬⿿ 30,000k

* '''Radius''': 2.0 â⿬⿿ 3.5 Solar Radii  

* '''Luminosity''': 10 â⿬⿿ 1,000 SOL   

* '''Temperature''': 7,500 â⿬⿿ 10,000k

* '''Mass''': 2 â⿬⿿ 3 Solar Masses

* '''Radius''': 1.5 â⿬⿿ 2.0 Solar Radii

* '''Luminosity''': 5 â⿬⿿ 10 SOL

===Type F: (Yellow â⿬⿿ White)===

* '''Temperature''': 6,000 â⿬⿿ 7,500k

* '''Mass''': 1 â⿬⿿ 2 Solar Masses  

* '''Radius''': 1.0 â⿬⿿ 1.5 Solar Radii

* '''Luminosity''': 1 â⿬⿿ 5 SOL  

* '''Temperature''': 4,500 â⿬⿿ 6,000k

* '''Mass''': 8 â⿬⿿ 1 Solar Masses  

* '''Radius''': 0.8 â⿬⿿ 1.0 Solar Radii

* '''Luminosity''': 0.1 â⿬⿿ 1 SOL  

* '''Temperature''': 3,500 â⿬⿿ 4,500k

* '''Mass''': 0.5 â⿬⿿ 0.8 Solar Masses  

* '''Radius''': 0.5 â⿬⿿ 0.8 Solar Radii  

* '''Luminosity''': 0.01 â⿬⿿ 0.1 SOL  

* '''Temperature''': 2,000 â⿬⿿ 3,500k

* '''Mass''': 0.02 â⿬⿿ 0.5 Solar Masses  

* '''Radius''': 0.01 â⿬⿿ 0.5 Solar Radii  

* '''Luminosity''': 0.00001 â⿬⿿ 0.01 SOL