Mass this is how multiple stars can form however some

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Unformatted text preview: nt may contain sufficient mass to form a star. mass This is how multiple stars can form. However some clouds are so massive that they However may form dozens or even hundreds or thousands of stars. of These “families” of stars are known as “clusters”. There are two types of clusters:- Open Clusters There and Globular Clusters. Globular Open Clusters Open Clusters Open clusters generally Open contain only a few hundred stars. hundred They lack and regular They structure and they are generally younger. generally Many very young open clusters are still surrounded by nebulosity left over from their formation. nebulosity Globular Clusters Globular Clusters Globular clusters Globular are huge balls of stars which can contain up to 2 million stars. million Diameter ~100pc They are composed They mostly of very old stars mostly Globular Clusters Globular Clusters Since they are Since so large and contain so many stars, they can be seen over large distances. distances. Clusters Clusters Star clusters are very important to astronomers. Since they all formed at the same time from the same cloud of gas, their stars are all the same age and they are all at the same distance. This enables us to find both the distance to the cluster and its age. Clusters Clusters We find the distance to the cluster by plotting an HR diagram of the cluster, using the apparent magnitudes of th...
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This note was uploaded on 08/27/2013 for the course ASTRO 1402 taught by Professor Clark during the Fall '11 term at Texas Tech.

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