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Astronomy (103)
ASTA02H3 (22)
Lecture

# Astronomy - Session 7

7 Pages
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School
University of Toronto Scarborough
Department
Astronomy
Course
ASTA02H3
Professor
Parandis Khavari
Semester
Winter

Description
Astronomy - Session 7  H-R Diagram  luminosity and absolute magnitude  formulas  inversely proportional  ex. x and x y y  Interstellar Matter (ISM)  combination of gas and dust  not uniform  temperature  not uniform  warmest temperature, 30 K  colder  more dense  nebula  clumped areas of ISM  stellar nursery („clump‟ in nebula)  low temperature  allows atoms to bind  giant molecular clouds  mostly Hydrogen  accompanied by CO2  CO 2mission  trace where denser clouds/clumps  more matter  gravity  gravitational collapse  must have be triggered by a mechanism  this mechanism usually comes in form of a shock wave  shock wave  a sudden change in pressure that travels as an intense sound wave  triggered by  1. birth of a hot star  2. supernova explosion  3. collision of two ISM clouds  4. movement of galaxy‟s spiral arms  mass of GMC (giant molecular cloud)    spiral galaxy   arms push and compress gas  (similar to food proc)ssor  Q. What factors oppose collapse (gravitational)?  low temperature  molecular cloud  no nuclear fusion  movement of particles  thermal energy opposes gravity  atoms move at  average velocity  √  Boltzmann constant   mass of particle   factors opposing gravitational collapse  1. thermal energy of particles  2. magnetic field  3. motion of turbulent gas  luminosity    (area)  suggestion: read “Dangerous Science”   enemy of gravity  motion  turbulent gas  thermal energy  star formation  thousands at the same time  approx. six million years  a collapsing cloud of gas doesn‟t form just two stars  star cluster  a group of stars that are formed together  gravitationally bound  stellar association  hot and gravitationally bound  open cluster  weak and gravitationally bound  reflection nebula  know the different types of nebula  evidence of the formation of protostars  protostars  infrared  peak of temperature: infrared  not visible because  lots of dust
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