The Lives of Stars

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
February  26,  2013   Lecture  12:  Star  Formation   Star  Formation   • If  new  stars  take  a  million  years  to  make,  blue  stars  are  the  parts  where  we   can  expect  to  see  new  stars  being  formed     o Red  stars  can  be  old  or  new,  but  blue  stars  have  short  lives   • New  (young)  Stars   o Red  nebulae  à  hydrogen  gas;  dust  and  blue  stars   o Lots  blue  stars  à  lots  of  young  stars   § Star  cluster  that  appears  to  be  very  blue,  contain  a  large   fraction  of  young  stars     o Lots  of  dust  among  gas  and  stars  indicate  new  stars                                               • The  same  galaxy  seen  in  visible  light  show  hot  gas  and  stars  and  in  far-­‐ infrared  light  showing  cool  star   o Dust  absorbs  visible  light,  heats  up,  and  re-­‐emits  that  light  in  the   infrared   o Where  there  is  a  lot  of  dust,  there  are  a  lot  of  red  nebulae  and  blue   stars   • The  Orion  Nebula  is  a  nearby  star-­‐forming  region   o Dark  patches  indicate  the  large  amount  of  dust  and  gas  that  block  out   the  background  light   o Often  these  dark  and  dusty  structures  are  studded  with  very  young   stars.  They  are  where  the  stars  form   o Usually  these  nebulae  with  dark  structures  are  rich  in  molecules,   often  quite  complex  ones.  These
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