Astronomers learn about the surface tempertures of stars from their <1> spectra. They look at the particular spectral lines present and their relative strengths and assign the star a spectral type. The spectral sequence is 0, B, <2>, F, G, <3>, M. A very hot blue star could have a spectral type of <4>. The spectral type of the sun is <5>. A star with a surface temperature of 3000 K could have a spectral type of <6>.
Spectal type information could appear on the <7> of the HR Diagram with the O stars on the far <8>. The other axis contains information on the intrinsic energy production of the star in the form of luminosity or absolute magnitude. Very large stars could be found on the <9> of the HR Diagam. This diagram will be very important for discussing how stars change throughout their lives which will be represented as a path on the HR Diagram.
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Spectal type information could appear on the <7> of the HR Diagram with the M stars on the far <8>. The other axis contains information on the intrinsic energy production of the star in the form of luminosity or absolute magnitude. Very small stars could be found on the <9> of the HR Diagam. This diagram will be very important for discussing how stars change throughout their lives which will be represented as a path on the HR Diagram.
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