Stars have different characteristics, that tell us about it's size, the stages the star is on, or is going to experience, and much more. One of these characteristics is Luminosity which is the absolute magnitude, or in other words is how much energy a star emits. Spectral Types show the non-thermal radiation of light from stars. This is helpful because each element has a different Spectral Type. The Temperature of a star also tells us things about the star. The temperature can be determined by color. Blue stars have a hotter temperature, while red stars are cooler. Hydrogen turns into Helium on stars, and the temperature can tell us how fast this is happening because, the hotter the star the more fusion occurring. Main Sequence stars are considered stable stars because their brightness and temperature are usually relative to each other.
http://outreach.atnf.csiro.au/education/senior/astrophysics/photo
http://www.universetoday.com/39974/hertzsprung-russell-luminosity.htmldiagram/metry_
http://cas.sdss.org/dr3/en/proj/advanced/spectraltypes/
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