The red dwarf stars are the smallest stars in the universe and also the highest in number. They are comparatively cooler than the sun. They also have the longest life than any other star. There is another type of stars that are smaller than the red dwarf stars, known as Brown Dwarfs. Let’s find out some more facts about Red dwarf stars
Red dwarf size
The red dwarf stars have a mass that is 0.08 to 0.6 times that of the Sun. Or one could also say that our sun’s mass is 2.5 times that of a red dwarf star.
Other Names of Red Dwarf Star
Red Dwarf Stars are also called by the name of M Dwarf Star or M-Type Star. Our sun is a G2V Star.
The stars are assigned letters O, B, A, F, G, K, and M as per their temperature, with O being the hottest and M being the least hot.
How to Spot a Red Dwarf in the Night Sky
You can’t. A naked human eye cannot spot a red dwarf in the sky because they’re so dim and small. 80% of the stars in the universe are red dwarfs.
The luminosity of a red dwarf star is only 0.1 times that of the sun.
2/3rds of the stars that are near to us are red dwarfs. In fact, the nearest star to the sun, Proxima Centauri, is a red dwarf too!
An example of a red dwarf star, Proxima Centauri, despite being so close to us is not visible to the naked eye.
The stars that we see in the sky are large, bright and searing hot stars.
How Do Red Dwarfs Die (Red Dwarf Lifespan)
As already explained, the red dwarfs live longer than any other star. A star dies when the hydrogen in its core gets entirely used up during the nuclear fusion.
While the sun is expected to die in a billion years, a red dwarf star would die in a trillion years.
The red dwarfs are very slow at finishing up their fuel. This is the reason they live so much longer.
The life of a red dwarfs usually lasts for trillions of years.
Also, the smaller the red dwarf, the longer will be its life.
Temperature of a Red Dwarf
To give a better estimate, the effective temperature of our sun is 9900 F. The temperature of a Red Dwarf is about 6380 F.
Our sun is a yellow dwarf and also comparatively cooler than O, B, A and F Type stars.
Classification of Red Dwarf Stars
Red Dwarfs that are small in size look incredibly similar to brown dwarfs, which makes it hard for the astronomers to classify them.
However, by studying and measuring the temperature of these stars, the classification can be made easier.
Life-Supporting Red Dwarfs?
Since the majority of the stars in our universe are red dwarfs, there is a possibility that life would evolve in a way that it can survive in the environment provided by planets surrounding the red dwarfs.