Lecture08 - Astro Nova Feb. 14 Valentines day Deep Impact...

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Astro Nova Feb. 14 – Valentine’s day Deep Impact searching for exoplanets transit eclipses Accurate distance to Cepheid star RS Puppis light echo from surrounding nebula 1.4% accuracy
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Previous Lecture Extremes of star formation, mass limits T Tauri stars Herbig-Haro objects Planet formation Stellar structure four key physical relationships several auxiliary functions stellar models
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Quiz Question 1 What happens to a protostar of mass less than 0.085 M Sun ? A. Nothing B. After a long period of contraction, it starts nuclear reactions in its core and becomes an M-type star C. It slowly contracts and cools, becoming a brown dwarf D. It rapidly expands, blowing itself apart before it can become a star E. Nobody knows – these objects are too small and faint to be observed
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Quiz Question 2 What is a T Tauri star? A. A newly-formed star with a very strong stellar wind B. A star near the end of its life, shedding its outer layers into space C. A very high mass protostar at the beginning of its contraction phase D. A low-mass protostar that is rapidly accumulating interstellar material that is falling into it E. A young star with a very bad horoscope, advised to avoid romantic entanglements today
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Quiz Question 3 How are Herbig-Haro objects related to young stars? A. The angular momentum of collapsing protostars throws these objects out into the surrounding space B. These are stars still in the process of formation in the vicinity of young stars C. These are clouds of nearby interstellar gas heated by the magnetic fields of the young stars D. These are clouds of nearby interstellar gas heated by jets from the young stars E. These are jets of hot material coming from young stars
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Homework Question CQ 19.10
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Lecture08 - Astro Nova Feb. 14 Valentines day Deep Impact...

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