Classification- Demonstrate an understanding of how stars can be classified according to their spectral type
- Demonstrate an understanding that a star's colour is related to its temperature
Each of these types is divided into further categories of 0 to 9. The Sun is classed as a G2 star.
There are further categories of W (Hotter than O) and R, N & S (cooler than M). These are very rare stars and you don't need to know about these for the exam.
Features of different types of stars
|O||Violet -white||30,000° K+
||Helium with Hydrogen|
|Hydrogen with Helium|
|Some Iron lines|
5,000 ° K
|Many Metallic lines|
|M||Red||<3,000 ° K
||Metallic and Carbon lines|
Give an example of how a star's colour is related to its temperature
Drag & Drop
Remember the types of stars from hottest to cooles using a helpful mnemonic:
e.g. Oh Be A Fine Girl Kiss Me
Er... some are better than others. Check out the link to other mnemonics below.