Chapter 13.Stellar Evolution

Chapter 13.Stellar Evolution - Stellar Evolution Chapter 13...

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1 Stellar Evolution Chapter 13
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2 Recall from the HR- Diagram Red Giants are ?: Main Sequence stars are: White Dwarf stars are:
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3 Gaseous Nebulae, the birthplace of the stars
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4
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5 Interstellar medium Gas = Hydrogen Dust = Carbon and Silicon ( a lot like soot or cigarette smoke) We sometimes call these clouds Nebulae - they are much larger than our Solar System Stars condense from clouds of gas and dust (the interstellar medium interstellar medium ) that exist throughout the disk of the galaxy
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6 Becoming a Star Step 1 – Cloud collapses Why do these clouds of gas and dust collapse? One idea is that a shockwave from the explosion at the death of a star known as a supernova cause the gas and dust cloud to become unstable and start to collapse
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7 Nova – a “new” star
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8 Beginnings
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9 Conversion of potential energy into HEAT Protostars IR Radio
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10 Herbig-Haro Objects – precursors to stars
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11 Bipolar flow
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12 Young star clusters and surrounding gas
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13 As the gas cloud collapses due to gravitational forces, the core becomes hotter and the density inside the core increases. (When you compress a gas, you heat it up) Eventually, the temperature and density reach a point where nuclear fusion can occur – This temperature is around a few million degrees , so fusion happens only in the centermost parts of the star. Fusion produces an enormous amount of energy and heat.
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This note was uploaded on 04/17/2008 for the course ASTRO 1504 taught by Professor Tabak during the Spring '08 term at Youngstown State University.

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Chapter 13.Stellar Evolution - Stellar Evolution Chapter 13...

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