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Young cluster �NGC 2264�
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Few million years old
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High mass stars have reached
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main sequence
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Lower mass stars are still
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approaching main sequence
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T Tauri stars
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Naming of classes of stars:
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Usually named after first star in
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class:� T Tauri
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Stars with letters (RR Lyrae) are
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typically �variable� stars
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Earlier stages hidden by dust
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