Astronomy CA REVIEW. Topics: Star Characteristics Star Life Cycles Galaxies Earlier topics are under Files: 3-1 REVIEW and 3-2 REVIEW. We are learning to : examine the life cycle of a star (characteristics; HR diagram)
Star Life Cycles
Earlier topics are under Files:
3-1 REVIEW and 3-2 REVIEW
We are learning to: examine the life cycle of a star (characteristics; HR diagram)
We are looking for: a description of how stars are classified by characteristics and then organized on an HR diagram.
Size- Giant, main sequence, and dwarf
Temperature- blue=hot; red=cooler
Brightness- apparent brightness and absolute magnitude
HR diagram shows temperature, brightness, color of stars and where the star is in its life cycle.
Used to graph the surface temperature (x-axis) vs. brightness (y-axis)
Hotter stars are on left side of graph; cooler stars on the right side of the graph
Brighter stars on top of graph; dimmer stars on bottom of graph
We are learning to diagram?: Examine the life cycle of a star and predict the next likely stage .
We are looking for: progression of the stages of a star’s life
Nebulae- cloud of gas and dust
Protostar- fusion begins
Main sequence- average star
Giant/red-giant- more massive stars
Nova/supernova - exploding star
White dwarf- no nuclear process
Black dwarf- no heat or light
Black Hole (area of large gravitational attraction) or Neutron star (very dense star)