The major categories of stars are:-
O-type stars
O-type stars are the hottest type of stars in this category, with a temperature of more than 33000K. They appear blue to us.
Examples- Mu Columbae, etc.
B-type stars
B-type stars have a temperature range of about 10000K to 33000 K of the temperature range. They, just like the O-type stars, appear blue to us.
Examples- Spica, Regulus, etc.
A type of star
They have a temperature range of about 7300 K to 10000 K. They appear white or bluish white in colour.
Examples- Vega, Sirius A, Altair
F-type stars
They appear yellowish white and their temperature range is about 6000 K to 7300 K
Examples- Procyon A
G-type stars
They have a yellow kind of colour and their temperature lies between 5200 K to 6000 K.
Examples- The Sun, Alpha Centauri A, Tau Ceti
M-type stars
Their temperature is less than 3700 K. They have a red colour
Examples- Proxima Centauri
L-type stars
They appear red brown in colour and have a temperature range of 1300 K to 2400 K.
Examples- GD 165B
T-type stars
These appear purple and their temperature ranges between 600 K to 1300 K.
Examples- Gliese 229B
Y-type stars
These stars are the coldest ones in this category and their temperature is less than 600 K! They are really dim in Appearance.
Examples- WISE 1828+2650
A little note:- These are not the stars' actual colours. This is what they would look like when veiled from the earth. For example, our sun is one of the G-type stars, which are yellow in colour. But the sun is not actually yellow, but it looks yellow when viewed from Earth due to Rayleigh scattering (I have talked about this in detail in the previous posts).
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