day_05 - September 8, 2010 First Exam Friday Reading...

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Unformatted text preview: September 8, 2010 First Exam Friday Reading assignment, Chapter 6 Sections 6.1 - 6.3, plus Section 1.2.4, Sections 2.1 - 2.5, Section 5.1, Betelgeuse pg 115ff Review Sheet posted Review Session Thursday 5 PM, here, WEL 3.502. Astronomy in the News? 1976 Mars Lander might have found life after all. Chlorates in soil might have masked organic signal. George Sudarshan, UT Physics, awarded Dirac Medal. Inspiral of red giant in binary system (next page) Pic of the Day Inspiral of carbon star red giant in binary system (courtesy Phil Plait, Bad Astronomy, Franny Gaede) Goal: To understand the observed nature of supernovae and determine whether they came from white dwarfs or massive stars that undergo core collapse. Type Ia no Hydrogen or Helium intermediate mass elements (oxygen, magnesium, silicon, sulfur, calcium) early on, iron later avoid spiral arms, occur in elliptical galaxies peaked light curve all consistent with thermonuclear explosion in white dwarf that has waited for a long time to explode, total disruption SN 1006, almost defnitely Type Ia Tycho, SN 1572 defnitely Type Ia - recent discovery, spectrum From peak light reected From surrounding dust, arriving only now. Kepler, 1604, probably Type Ia (no sign oF neutron star, same ejected composition as SN 1006, Tycho), but some ambiguities. IF recurrent nova U Sco with a white dwarF oF more than 1.3 solar masses becomes a supernova, it will probably be a Type Ia Type II Supernovae - other type discovered early in the study of supernovae, show Hydrogen in the spectrum early, Oxygen, Magnesium, Calcium, later Most occur in spiral galaxies, in the spiral arms , they have no time to drift from the birth site sometimes in irregular galaxies...
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day_05 - September 8, 2010 First Exam Friday Reading...

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