lec25 - Lecture 25 Formation of Stars Purdue University,...

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Unformatted text preview: Lecture 25 Formation of Stars Purdue University, Astronomy 364 1 Lecture 25 Dust and gas is mostly found in galaxy disks, and blocks optical light Quiz At optical wavelengths, interstellar dust causes a star to appear: 1. Redder 2. Bluer 3. Brighter 4. Fainter 5. None of the above Lecture 25 Purdue University, Astronomy 364 3 Molecular Clouds Translucent clouds T=15-50 K n~5x10 8-5x10 9 m-3 M~3-100 M Sun R~ 1-10 pc A V ~1-5 Giant molecular clouds T~20 K n~1x10 8-3x10 8 m-3 M~10 6 M Sun R~50 pc Giant molecular cloud cores T~100-200 K n~1x10 13-3x10 15 m-3 M~10 1000 M Sun R<1 pc A V ~50-1000 Sites of Star Formation The cores of molecular clouds are the likely sites of new star formation. Formation of Protostars There are many unanswered questions about the formation of protostars Since they form in very dense, opaque clouds of dust and gas they are very difficult to observe in detail...
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lec25 - Lecture 25 Formation of Stars Purdue University,...

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