A class X star is a super rare star. Out of a two hundred sextillion or 2×1023 stars (in our universe), there could be only be hundreds of them. While there are luminous blue variables (LBV), wolf-rayet stars (W), and navy-blue stars (N) that are generally more powerful than O-class stars, those types that are mentioned aren't main sequence stars, while class X stars can be.
Life[]
The class X stars typically live for only for 300-70,000 years depending on the mass. The more mass, the more longer it can live, so it will be longer for it to waste its energy. It's life is also short compared to a billion, which usually a tenth or fifth of an average star's lifetime.
Future[]
Many years later, it would become red metagiants, and explode into extreme metanovas, which are more extreme than hypernovas.
Many years later again, it will become a superpowered black hole or a ministar absorbing nearby objects light-years away, but will take a lot of years to absorb it fully.
Companion[]
Habitable Zone and Planet[]
Their habitable zones would be a few thousand AUs away, which is a fraction of a light-year. Due to the large habitable zone and being a super rare star. All of the stars, which is only hundreds of them, might not even have a planet, but the chances are very low.
Many will find candidates due large dark spots or unknown diming times because of its immense diameter and temperature.
Star Companion[]
Due to low class X stars, none will have a star companion. If it were to have a star companion, it might collide each other and form another class type star, hypernova, or metanova due to the mass of the class X star compared to its star companion which isn't a class X star.
Colors[]
Generally, these stars would be from light bluey purple (X9) to light violet (X5) and to light pure purple (X0), in terms of color. Generally, it is getting more bluer. It can even emit ultraviolet rays, but will never emit x-rays or gamma-rays. The fact that ultraviolet light can't be currently seen hinders confirmation that these stars do exist.
| Spectral type | Color |
|---|---|
| X0V | light pure purple |
| X1V | light slightly-pure purple |
| X2V | light pure indigo |
| X3V | light pure violet |
| X4V | light |
| X5V | light violet |
| X6V | light purplish violet |
| X7V | light purple |
| X8V | light pale indigo |
| X9V | light bluish purple |
Non-X class stars emitting pink glow[]
Intense ultraviolet radiation from newly formed stars can ionize surrounding hydrogen gas, stripping away electrons and causing the gas to emit a faint pinkish glow, this isn't actually forming new class X stars, but instead forming a random star. It won't even form a X-type star
Properties[]
The table only shows average mass, luminosity, and temperatures, it can be slightly different, even rarely (or will never, due to low X-type stars) a huge difference.
| Spectral type | Mass (Suns) | Luminosity | Temperature (Fahrenheit) |
|---|---|---|---|
| X0V | 80,000+ | 30,000,000 | 1,000,000 |
| X1V | 35,000 | 15,000,000 | 580,000 |
| X2V | 23,790 | 10,000,000 | 425,000 |
| X3V | 14,840 | 7,500,000 | 355,000 |
| X4V | 11,700 | 5,678,901 | 285,000 |
| X5V | 9,000 | 4,250,000 | 215,000 |
| X6V | 5,200 | 3,333,000 | 175,000 |
| X7V | 2,400 | 2,500,000 | 150,000 |
| X8V | 1,800 | 2,000,000 | 130,000 |
| X9V | 1,000 | 1,600,000 | 115,000 |
List of discovered X-type stars[]
There was only 2 class X stars that were discovered:
See Also[]
| Stellar Classes |
|---|
| Φ · Ψ · Ω · Q · DE · GR · σ ς · Θ · N0 · D · BS · Y · T · L · M · C · S · QS · K · G · F · A · B · LBV · β · O · W · N · X · n0 · Exotic (Π · Σ · Γ · Δ · μ) · δ · ζ · I · TŻO · BL · ℃ · ⩡ |