H-R diagram

http://earthsky.org/tonight/can-you-see-the-different-colors-of-the-stars

In the article ” Can you see the stars’ different colors?” it talks about the different colors stars produce. In our lecture tutorial we learned that the color of a star tells you what spectral class its in. Spectral classes are represented in the H-R diagram, is a scatter graph of stars showing the relationship between the stars’ absolute magnitudes or luminosities versus their spectral classifications or effective temperatures. We learned in class that using a H-R diagram can be used to tell a lot of properties of different stars. The colors range from blue-white to red and yellow, the hottest stars are the blueish ones and the cooler are the red-yellow ones. Most of the stars in this diagram are in the main sequence(the diagonal line going through the diagram).

The diagram also can show you the masses of the stars, the size, and the lifespan of the stars, depending on where they are on the diagram. The upper right has most of the large stars the supergiants, and the small ones are in the bottom called dwarfs. We learned that the color and light coming from the star can show the temperature as well. This relates to our 12th objective “I can explain how astronomers use the Hertzsprung-Russell diagram to study properties of stars” accordingly. I learned how to use the H-R diagram in the lecture tutorial that we had in class but this article is also very informative as well. It gives some great examples of stars that portray on the diagram what is being seen in the sky.

 

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