What are the classifications of stars?

Stars are classified by their spectra (the elements that they absorb) and their temperature. There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B stars are uncommon but very bright; M stars are common but dim..

What class star is the sun?

G2VSun / Spectral type

What is a main sequence type of star?

Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars. These stars can range from about a tenth of the mass of the sun to up to 200 times as massive. Stars start their lives as clouds of dust and gas.

What exactly is a star?

Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth.

What are the luminosity classes of stars?

Classification. Luminosity classes are labeled with Roman numerals from I to V: I are supergiant stars, II are bright giants, III are ordinary giants, IV are subgiants, and V are ordinary main sequence stars.

What are the 7 classes of stars?

Scientists classify stars by temperature and the elements they absorb, which are called their spectra. They have divided stars into seven main types. There are seven main types of stars: O, B, A, F, G, K and M. The O stars are the bright, hot, blue stars and the M stars are the dimmer, cooler, red stars.

What are the 7 spectral classes of stars?

The stars are divided into 7 classes designated by the letters O, B, A, F, G, K, and M; the hottest stars (O and B) are blue-white in color, while the coolest (M) are red.

How do we know what stage a star is in?

A star’s life cycle is determined by its mass. The larger its mass, the shorter its life cycle. This is the stage our Sun is at right now. As the main sequence star glows, hydrogen in its core is converted into helium by nuclear fusion.

What luminosity class is Antares?

Alpha Scorpii A