Dværgstjerner

Dværgstjerner, or dwarf stars, are a class of stars that are smaller and less luminous than main-sequence stars like our Sun. They are categorized into several subclasses based on their spectral type and characteristics. The most common types of dwarf stars include red dwarfs, yellow dwarfs, and white dwarfs.

Red dwarfs are the smallest and coolest type of main-sequence stars. They have masses ranging from about 0.08 to 0.5 solar masses and surface temperatures between 2,400 and 3,700 Kelvin. Due to their low mass and temperature, red dwarfs have very long lifespans, potentially exceeding a trillion years. Yellow dwarfs, like our Sun, have masses between 0.8 and 1.2 solar masses and surface temperatures around 5,500 Kelvin. They are in the prime of their stellar life, fusing hydrogen into helium in their cores.

White dwarfs are the remnants of stars that have exhausted their nuclear fuel. They are extremely dense, with masses comparable to that of the Sun but radii similar to Earth. White dwarfs have surface temperatures ranging from 4,000 to 100,000 Kelvin and are characterized by their strong gravitational fields, which cause them to cool over billions of years.

Dværgstjerner play a crucial role in the universe, as they are the most numerous type of star. They make up about 75% of the stars in the Milky Way galaxy and are often found in binary systems. Despite their small size, dwarf stars can have significant impacts on their environments, influencing the formation and evolution of planets and other stars.