Neutron Stars and Black Holes

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Department
Astronomy & Astrophysics
Course
AST201H1
Professor
Michael Reid
Semester
Winter

Description
AST201H-­‐  Stars  and  Galaxies         Professor  Michael  Reid                                                                                                                            Lecture  Notes     March  19,  2013   Lecture  17:  Neutron  Stars  and  Black  Holes   Neutron  Star   • One  of  the  three  possible  outcomes  of  supernova  –  Neutron  stars,  black   holes  and  no  remnant   • Neutron  stars  are  very  dense  and  have  a  diameter  about  10km   • Neutron  stars  have  very  powerful  magnetic  fields  that  channel  material  to   their  poles,  heating  them  up   • Pulsar  –  a  kind  of  neutron  start  whose  radio  waves  beam  and  sweep  around   the  sky   • However,  what  would  happen  if  a  REALLY  REALLY  massive  star  die?   o A  star  that  is  25  times  bigger  than  the  Sun,  neutron  degeneracy   pressure  would  not  stop  it  from  collapsing   o In  fact,  no  known  force  could  stop  such  an  object  from  collapsing   forever   Black  Holes   • Higher  density  à  higher  V escape   • Once  the  escape  speed  reaches  the  speed  of  light,  nothing  can  ever  escape   from  it,  it  becomes  a  black  hole   • Diagram  of  Black  Hole   •                                               • V escape  =  C  at  the  event  horizon   AST201H-­‐  Stars  and  Galaxies         Professor  Michael  Reid                                                        
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