The Sun continued

3 Pages
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Department
Astronomy & Astrophysics
Course Code
AST201H1
Professor
Michael Reid

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Description
January  29th,  2013   Lecture  7:  Light  and  Matter  (continued)  and  the  Sun   Midterm  #1  next  Thursday  4:00pm-­‐5:00pm,  check  Portal  for  Room   Assignment;  review  session  on  Wednesday  2pm  @OISE  G162;  study  guide   Dense  Object  (gas,  liquid,  or  solid)   • Dense  objects  emit  lights  not  as  individual  atoms,  but  as  a  pack  of  atoms   o Emits  Sum  of  every  colour  -­‐  a  complete  and  continuous  spectrum  that   has  no  gap   o Dense  objects  emit  some  lights  at  all  wavelength  which  we  called   continuous  spectrum                                     • The  particular  continuous  spectrum  emitted  by  dense  objects  is  called   blackbody  spectrum   o Most  dense  objects  emit  something  very  much  like  the  blackbody   spectrum     • Blackbody  Spectrum   o As  it  gets  hotter,  this  spectrum  emits  more  light  at  a  shorter   wavelengths   o As  blackbody  gets  hotter,  it  emits  more  light  overall   § The  star  that  is  red,  the  temperature  is  relatively  cool  among   the  stars;  the  star  that  is  blue,  th
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