What are the three main categories for stars?

Answer 1

I am not sure that you can clasify stars into just 3 main categories. However there are a number of ways you can classify stars:-

• In astronomy, stellar classification is a classification of stars based on their spectral characteristics (the elements in their atmospheres).
• Stars are also classified using the letters O, B, A, F, G, K and M ( Ostars are "blue", B "blue-white", A stars "white", F stars "yellow-white", G stars "yellow", Kstars "orange", and M stars "red")- (there are some sub classification of these)
• There are Secchi classes - Class1 - Class V
• The Harvard classification system is a one-dimensional classification scheme based on surface temperature
• The two-dimensional Yerkes spectral classification is based on temperature and luminosity
• You can also calssify stars on how far they are through their lives (protostar - main sequence - red giant - stellar reminent)
• You can classify stars on how massive they are or on how large they are.
• Stars may be classified by their heavy element abundance (metallicity), which correlates with their age and the type of galaxy in which they are found (a sort of cosmological classification). Stellar populations are categorized as I, II, and III, with each group having decreasing metal content and increasing age.

Answer 2

There are many types of stars and many more categories.

• Luminousity: Subdwarf , Dwarf , Subgiant, Giant, Bright giant, Supergiant, Hypergiant, Blue straggler
• Spectral type: O, B, A, F, G, K, M, L, T
• Remnants: Black and White dwarf, Neutron star (Pulsar ·Magnetar) · Stellar black hole · Compact star (Quark · Exotic)
• Colour: Black, brown, red, orange, yellow, white, blue.
• Fusion: Hydrogen, Helium, and Oxygen/neon/Magnesium

Answer 3

smallest, smaller, small, bigger, biggest